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In this review, I’ll give you my ratings and share our reviews of the leading all-around carbon disc wheelsets that perform well on a wide range of road terrain and racing disciplines.

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How To Choose The Right Wheels For You

The Best Aero Bike Wheels

The Best Lightweight Wheels for Climbing

How Wide Wheels and Tires Can Make You Faster


We’ve now seen a 4th generation of the evolution of carbon disc wheelsets. What started as modifications of rim brake wheels is the only new carbon wheelset choice you have.

While it’s still early in this latest generation and most carbon disc brake wheelsets available to us enthusiasts are 3rd generation ones, the 4th generation of wider, lighter, tubeless-only, and hookless rims are upon us.

Many of the latest generation wheelsets will also be less expensive than those from the prior generation and, thanks to new standards, will be easier to install tires on, though they will still not be as easy as clinchers.

Carbon Disc Wheelset Evolution 2014-2022

The most notable takeaway for me after assembling this chart is how quickly things have changed and how much the latest generation of all-around wheels for road disc bikes are different than those we rode just a few years ago on our rim brake bikes.

In fact, most of the leading wheelset companies have stopped selling carbon rim brake wheels, and all development time and money is spent on disc brake wheels. That’s why I’ve called the 4th generation “All In On Disc Brake Wheels.”

These changes have made the all-around carbon disc wheelset faster, more comfortable, more durable, and more versatile than all-around rim brake wheels ever were without any effect on stiffness, acceleration, or handling.

Remember when better braking was all that most people fixed on when talking about the benefits of going to road disc bikes? Well, the ability to get all the benefits I just summarized is a whole lot more than better braking, which was enough of a reason for many people to go with a road disc bike in the first place.

Let me go through some of these benefits a bit more.

FasterWider rims mean you can run some 28C tires to gain more comfort without incurring additional drag. Wider tires also reduce losses or energy that saps your body from the road vibrations that come with a narrower tire that you need to run at a higher inflation pressure to maintain the same opposing force as a wider one. (See my post on how wide wheels and wide tires can make you faster for more on this.)

Most of the Gen 3 disc brake wheelsets were designed for 25C tires that, once inflated, will be narrower than the external rim width. This makes the rim-tire combination more aero than using 28mm tires when your speeds top 20mph/32kph. And aero gains are something you pay for when buying deep or all-around carbon disc wheels.

More Comfortable – Going tubeless allows you to run your wider tires at lower pressures without pinch flat concerns. Lower pressures make for a more comfortable ride and fewer impedance losses.

More Durable – The best carbon rim brake wheels use resins with high melting points to make it much harder for riders to warp them when they apply or drag the brakes. The trade-off is that these resins can make the wheels a bit brittle. While I can’t quantify the difference, dedicated disc brake wheels use lower melting temperature resins that are less brittle.

More Versatile – Because the latest generations of all-around carbon disc wheels have gotten wider, more tubeless friendly, and more durable, you can comfortably ride them on gravel and cyclocross tracks with the appropriate tires. Those with 23mm or 25mm inside rim widths are as wide as dedicated gravel wheels. Doing this can save you from having to buy another set of wheels to excel on dirt, grass, and gravel roads and trails.

A few words about tubeless tires. You’ll notice that tubeless tires are often mentioned in my description of developments and their benefits.

Removable valve cores, easier-to-mount rims, and a whole lot more experience with tubeless tires while testing all these carbon disc wheelsets have made installing them easier and cleaner and mellowed me somewhat to the minimally more added work they bring over standard clincher tires.

Lower prices, lower rolling resistance (lower than tubular or clincher tires), the ability to run lower pressures, more comfort, and having nearly every puncture seal so far have made me look past many of my previous objections to tubeless.

While tubeless still requires a learning curve, I can now say the benefits they add to the right rims can outweigh the diminishing disadvantages and make it well worth getting up that curve if you want those benefits. My review of tubeless tires lays all of this out in more detail and gives you my recommendations for the best ones.


For each In The Know Cycling review, I evaluate category-specific criteria in four groups – performance, design, quality, and cost. The criteria that matter most in those groups for the best all-around wheels for road disc bikes are as follows:

Performance:  Versatility, specificity, aero drag (momentum), sidewind stability, lateral stiffness, vertical compliance, aka “comfort,” responsiveness, and durability.

Design:  Wheel weight and material, rim depth, rim inner and outer widths, rim profile, hub and spoke design, and wheel finish.

Quality: Warranties, crash support, and service/support.

Cost:  Purchase price, cost of ownership, and replacement cost.

I use most of those criteria for all-around disc brake wheelsets, with a few exceptions and changes in emphasis that I’ll point out below.

You can’t measure a wheelset’s aero drag on the road, so, as a surrogate, we evaluate and compare how well different wheelsets maintain their momentum at different speeds.

Since the latest all-around carbon disc wheelsets are deeper than earlier ones, sidewind stability has become increasingly important.

And since all-around wheels are intended for a wide range of paved road terrain – flats, rollers, climbs, descents – and for mixed or unpaved surfaces and for cyclocross racing, and even gravel, versatility is key. Specificity, or how well a wheelset performs in a specific situation, is a criterion best used for dedicated aero, climbing, or gravel wheels.

Stiffness and compliance are important for all wheels.

Responsiveness, or how lively and light your wheels feel as you accelerate and handle your bike at different speeds, across varying terrain, and through a range of cornering situations, is a key measure of all-around wheels but less in others.

Durability is obviously important for any wheelset. However, we can only measure it on an exception basis since testing one set of wheels is not representative of the performance of the many wheels a company makes of a specific model. We also don’t test it long enough to induce failure. If it fails or has issues early in our testing, or we hear or read about shops and users reporting chronic problems, we’ll certainly report that.

Design specs like weight and rim width are worth noting but may or may not deliver the intended performance those specs are often associated with. A wheelset’s actual responsiveness, stiffness, and comfort on the road, for example, are far more important than the design specifications and new technology that we often get so hung up (and sold) on and that we too easily equate to those performance attributes.

Considering the range of options the road cycling enthusiast has to choose from in all-around wheels for road disc bikes, I recommend a Best Performer (independent of price) but not a Best Value wheelset (considering performance and price) in this review. For less expensive all-around wheels which unfortunately do not perform as well, check out my review of the best value carbon wheelsets here.

Quality is either a go or no-go in my recommendations. I won’t recommend anything that doesn’t have an acceptable level of quality according to my criteria. I’m also not going to recommend something that has superior quality but under-performs or has higher costs. When two wheelsets perform more or less the same, I do consider quality and cost criteria in recommending one as a Best Performer.

With all of that noted, here are my evaluations of the best all-around carbon disc wheelsets for road cycling enthusiasts.


Go directly to reviews:

Bontrager RSL 51 TLR

Cadex 50 Ultra

Campagnolo Bora Ultra WTO 45 Disc Brake

DT Swiss ERC 1400 DICUT 45


Roval Rapide CLX II

Zipp 454 NSW


Best Performer


Zipp 454 NSW carbon disc wheels

If you don’t want to pick between wheels that would be fast on flats vs. on rolling hills vs. on climbs or in a training ride, group ride, road race, or crit, I recommend the latest Zipp 454 NSW Tubeless Disc-brake wheelset. It will be fast in all those situations and the fastest around in many of them.

At US$4220/£3376/3798, it better be. But if top performance in a single wheelset in nearly every situation and against nearly every criterion is important to you, it just may be worth it.

That’s the conclusion that fellow testers Nate, Miles, and I reached after riding the Zipp 454 NSW.

At its core, it’s a stiff, deep, and light wheelset. Those three attributes, along with the 454 NSW’s fast-engaging rear hub, make it so responsive that it redefines the term “snappy.”

Practically, the 454 NSW’s superior ability to accelerate made it an ideal partner for 20-30 second break-away efforts and sprint finishes. Except for on the steepest of slopes, Miles said this wheelset “made me faster on nearly any effort I tried.”

And Miles is already a fast dude, regularly winning P/1/2 masters crits, road, and stage races in the Northeast and finishing top 10 at US Nationals.

Even for me, a more average B group level roadie, the sensation of riding this highly responsive 454 NSW wheelset was energizing almost from the first pedal stroke. Once into my rides, I felt like I had great legs every day I rode them.

Nate, our A group Bullet Train ride leader who rode the 454 NSW on some of those early morning hammerfests and out front of 100 and 140-mile one-day rides with 8,000 to 10,000 feet of climbing, initially resisted giving them up for others to test. Despite being a peace-loving guy, he paraphrased Charleton Heston’s line about prying them out of his “cold dead hands.”

Nate has been testing all sorts of wheels along with me for at least the last 5+ years, including the prior generation 454 NSW rim brake wheels. His feedback started with a most definitive statement.

These are the first wheels where I haven’t felt like I was making a tradeoff between aero and climbing performance.

I don’t know what they cost (I’ve trained him not to look at price or specs and just judge performance – ed). I’m sure it will be high. But, I would put them in the category where it just MIGHT be worth paying $1,000 more for these than others which are ALMOST as good but not on all characteristics. (Nate’s capitalization.)

Unlike Nate’s experience with the earlier 454 NSW rim brake wheels that wobbled in crosswinds to the point where he slowed on each fast downhill section of a looping road race, he felt confident on similarly fast, windy descents riding this new 454 NSW disc brake wheelset.

Miles felt far less comfortable in some windy situations. When the breezes picked up to about 20 mph and came directly from the side, it felt like he was getting a slight body check and was pushed around far more than with any wheelset he’s ever ridden.

It may be that the 454 NSW’s sawtooth rim profile is best at reducing crosswinds at lesser yaw angles than what Miles experienced and perhaps more similar to those Nate did. For me, I always seem to be riding into headwinds no matter what course I’m on, and it was no different riding the 454 NSW.

The only other slight knock we had on this carbon disc wheelset was its ability to hold its momentum on the flats at speeds north of 25mph. While the 454 NSW rolled just fine at that speed, it felt like we needed a bit more effort to keep pace with the average aero wheelset that is often 5-10mm deeper and 200-300 grams heavier. It’s simply a matter of physics and a tradeoff the speediest of enthusiasts might want to keep in mind.

Zipp 454 NSW carbon disc wheelset

You are likely doing a lot of handling when you aren’t on a breakaway, going over rolling terrain, heading up climbs, or sprinting for the line. And the good news is that this is another area where the 454 NSW outperforms most wheelsets.

We experienced precise, confident, high-speed cornering. These carbon disc wheels do exactly what you want them to do in big arc turns, 50+mph downhills, slower switchbacks, and even quick, last-second movements.

With the right tires and at the right pressures, the ride is also very comfortable, no matter how good the pavement is. While many all-around wheels are similarly compliant nowadays, some wheels around the 454 NSW’s depth tend to give up comfort by using a narrower rim to keep weight down. You make no such trade-off with these Zipps.

Add to all of this a very smooth rolling hubset and almost silent, fast-engaging freehub. That makes it even more tempting to start a breakaway and easier to crank up a sprint.

The 454 NSW defies categorization. It’s the wheelset equivalent of a hors categorie climb, one that is beyond categorization.

Based on its 55 to 59 mm deep rims, you might think the Zipp 454 NSW is an aero wheelset. You wouldn’t be wrong. Judging from its 1388-gram weight, you might guess it climbs well. Indeed it does. Hookless, 23mm inside rim width will make for a very comfortable ride, right? Yes, and perhaps worthy of riding gravel, though we didn’t test it off-road.

So are these all-around wheels? Yes, that may be the most encompassing definition though it is faster and better than any all-arounder we’ve tested on terrain that never exceeds 5-6% up or down and faster than many aero wheels on the flats and climbing wheels on steeper pitches.

Perhaps it’s best to call it an all-everything wheelset. Or just fast anywhere you want to ride.

You can buy the Zipp 454 NSW using these links to Competitive CyclistBTD (BikeTiresDirect), Sigma Sports, and BikeInn, all stores I recommend and rate highly for their prices, customer satisfaction, and support. You can also find it and compare prices using this link to Know’s Shop, which shows all the stores I recommend that carry this product.

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Best Performer


ENVE SES 4.5 disc brake wheelset

The second-generation ENVE SES 4.5, born the SES 4.5 AR, continues to stand above all other all-around wheels in the performance carbon disc wheelset price category (US$2000/£1600/€2000 to $3000/£2300/€3000).

In my on-the-road testing, I’ve found the SES 4.5 performs as well or better on the combination of factors I think matter most to your speed and enjoyment of road cycling wheels. It’s fast, stable, stiff, comfortable, responsive, and versatile. It’s got it all.

And it’s just a hell of a lot of fun to ride. The ENVE SES 4.5 seems to glide along the road with no drama as you accelerate from a start, transition from flats to hills, and take corners at high speed. It’s unbothered by crosswinds and coasts with nary a sound from the freehub.

To be clear, the ENVE 4.5 is no recreational stroller. Rather, it’s seriously fast, deceptively so with its relatively modest looks and quiet demeanor.

I rode the new 4.5 for the first time on a recovery ride at the end of a week of training full of hard anaerobic and VO2 max intervals. “Let’s just ease into it,” I told myself, never wanting to judge a wheelset I’m testing for the first time on a hard day in the saddle.

Despite being physically and mentally tired, riding the ENVE SES 4.5 re-energized me. It responded quickly and easily to my efforts, flowed through corners, and smoothed hills and rough roads.

As I put it through harder efforts in the days that followed – VO2 intervals, 7% climbs, and on-my-limit group rides – the 4.5’s performance helped me be at my best, or at least better than on other days with other wheels rolling beneath me.

Regardless of the specs, which I’ll get to in a minute, the ENVE SES 4.5 feels light and lively and maintains my momentum in the 20mph/32mph to 25mph/40mph speed range incredibly well.

ENVE SES 4.5 all-around wheels

Stiff, efficient, comfortable, quiet, fast. Total confidence and total pleasure regardless of terrain, surface, effort, or speed.

It’s somewhat surprising that a second-generation wheelset, little changed from one introduced six years before, could still be the Best Performer among its all-around carbon disc wheelset peers. While others have certainly improved on individual performance criteria I use in evaluating wheels, none have reached the same level as the ENVE 4.5 across all of them.

If performance balance is a measure of all-around wheels and great performance across all criteria is the mark of the best, then the ENVE 4.5 still stands atop the rest.

My spec-obsessed evil twin always wants to get in the way of my performance-focused good twin and influence you. Well, I’ll give him some space to speak up here.

For years one of the key differences between the original 4.5 AR and most other road wheelsets was its 25mm inside width. That continues with the new 4.5 (25.3mm per my measurement) and is why I can run my tire pressure low to get the comfort I enjoy even on rough paved and dirt road surfaces. Other wheelmakers, notably Zipp and Bontrager, now make rims with 23mm inside widths for wheels of similar depth, while most other brands still make road disc brake wheelsets with a 21mm inside width.

On the outside, the 4.5 rims have widened a couple of millimeters per my measurements from the 4.5 AR to 32.8mm for the front wheel and 32.4mm for the rear. The rims have also gotten about 1.5 mm deeper, now 51.8mm front and 56.5mm rear.

The wider, deeper rims, says ENVE, come from adding their anti-pinch-flat design to the 4.5, something the SES 3.4 AR (now the SES 3.4) has had since it was introduced. Whatever, I’ll take the added width and depth if it improves the performance.

It seems so. With the slightly wider rims, more models of 28mm labeled tires can be used on the 4.5 at lower pressures to give you optimal aero drag and rolling resistance performance and better comfort across rough roads. I get into all the details of that in my tubeless tire review.

Note also that the front and rear wheels have different dimensions and also different shapes. The front wheel has a U-shaped profile designed to improve its stability in crosswinds, while the rear is deeper and has a V-shaped one to improve its aero performance.

In the last couple of years, Roval, Hunt, and Parcours have introduced wheelsets with different front and rear dimensions and profiles, though none are as wide internally as the 4.5.

ENVE’s measurements show the average SES 4.5 weighs about 100 grams less overall than the 4.5 AR did and, more importantly, their deeper, wider rims weigh about 110 grams less than the first-generation ones.

My demo ENVE 4.5 wheelset came in at 1518 grams with the Shimano/SRAM 11-speed HG freehub (a SRAM XDR 12-speed one weighs about 20 less) and with the wheels taped but with no valve stems in place. That still puts it about 50 grams heavier than the actual weights of the narrower and shallower Bontrager RSL 51 and Campagnolo Bora Ultra 45 wheelsets and 140 grams more than the US$4200 Zipp 454 NSW. The difference accelerating from a dead stop is minimally better with the Bontrager and Campy and more noticeably so with the Zipp.

While more and more rims come through pre-taped with valve stems in place these days, ENVE continues to send you tape and stems to install yourself. This video demonstrates how to install ENVE tape; ignore the part at the beginning about using clincher tires – it doesn’t apply to the current line of SES wheels.

ENVE justifies this DIY approach by wanting to give you or your retailer the option to adjust the internal nipples for spoke tension and wheel true before applying the tape that covers access to the nipples. Internal nipples reduce the drag of external ones by 0.75 watts per wheel in ENVE’s wind tunnel tests. It’s nothing to sneeze at for those who believe in marginal gains.

I don’t know about you, but even with all the wheels I test, I’ve never found the need to have a tension meter or trueing stand on my workbench. Hand and eye inspection can detect true outliers, and even with them, I’m not wrench enough to start messing with my spoke nipples.

I expect that ENVE ships very few wheels that are out of tolerance. Heck, they were among the first to offer 5-year parts and labor warranties on their wheels. So, they likely have a pretty good fix on the quality of their wheels, all of which are made in their United States factory. I would think most of us and our store mechanics would prefer ENVE tape their rims before shipping them to our doorsteps, even though some of us have become pretty good at taping them ourselves over the years.

If a wheel were to come in with spoke tension or true that’s not up to spec, I believe their warranty should pay a trained mechanic to adjust the nipples and retape the rim.

Note also that the ENVE SES 4.5 (and all current ENVE SES and Foundation wheels) use hookless rims and require tubeless tires whether you use sealant or tubes inside. Fortunately, the list of compatible tires for that combination is growing longer and longer and includes the top-performing tires from most brands. You can see the list of compatible and incompatible tires per ENVE testing.

For those of you still resistant to hookless rims because you want to be able to inflate your tires as high as you like without the worry of them blowing off, please understand a few things about the SES 4.5 wheels.

ENVE SES 4.5 disc brake wheelsetFirst, with the 4.5’s 25mm inside width, you won’t want to inflate your tires past the maximum recommended pressure of 80psi, even if you weigh the maximum recommended rider weight of 250lbs/113kg. They’ll be increasingly uncomfortable and slower above the recommended pressures shown in ENVE’s chart. As you can see there, it shows only 67 psi as the starting tire pressure recommended for the heaviest riders.

Second, ENVE has been making hookless rims and testing them with tubeless tires for years. For their 25mm inside width rims, they have established 80psi as the maximum recommended tire pressure and 90psi for their 21mm inside width hookless rims. Both of these pressure levels are higher than the ETRTO and ISO 5 bar, 72.5 psi standard for hookless rims of any width.

And ENVE only lists tires as compatible if they stay on their rims in their tests through 150% of the maximum recommended pressure. So I think there’s plenty of performance and comfort motivation to keep your tires well below the max pressure and a pretty good safety zone if you revert to your 20-year younger self in the presence of a tire pump on an off day.

Unlike earlier incarnations of SES wheels, where you could order Chris King, Industry Nine, DT Swiss, or ENVE’s own branded hub with carbon shells, there is only one hubset available on the 4.5.

Fortunately, it’s the ENVE hub with alloy hub shells, a direct drive model they’ve been putting on most of their wheels for the last few years. These are the same ones I’ve used with no issues (and performed no maintenance on) with the ENVE SES 5.6 and 3.4 AR wheelsets I bought to benchmark other brands of wheels with performance goals similar to those.

You can order the 4.5 with either an HG, XDR, or N3W freehub body compatible with your Shimano/SRAM 11-speed, SRAM AXS 12-speed, or Campagnolo groupset.

Finally, some ENVE wheelsets I’ve tested in the past have come through with hair-thin, 2-3mm long white lines in the carbon accumulated at random places along the rim’s spoke edge. While hardly visible unless you go around looking for such things (I do), I and some readers found this rather annoying and even worrisome.

The issue turns out to be only a cosmetic one, apparently caused by an oxidation side effect of the hardening agent used in the resin. While a sample size of one, the new SES 4.5 I tested had almost none of these white lines. ENVE is using a new resin in their new line of SES wheels that, in part, has enabled them to reduce the rim weight but also is supposed to address the oxidation issue that caused the white lines in the earlier resin.

We’ll keep an eye on this. Literally.

The ENVE SES 4.5 price has gone up US$300 to US$2850, and current exchange rates make it RRP £3300, €3800, though often sells for less in those currencies. It is available using these links to recommended stores Competitive CyclistBTD (BikeTiresDirect), Merlin, and Sigma Sports. It’s hard to justify – you’ll need to make peace with your own budget watchdogs – but it’s also hard to say no to a wheelset that still stands above its competition.


It’s easy to judge any wheelset by looking at what it does well, what it doesn’t, what it costs, and what it looks like. And, if you’re into design and engineering, add specs and tech to your evaluation.

I’ll get to much of that. But when it comes to the Bontrager Aeolus RSL 51 TLR, let me start with the bottom line.

The RSL 51 is the definition of a modern all-around road disc wheelset.

Bontrager RSL 51 carbon disc wheels

This mid-depth Bontrager does most of the things road cycling enthusiasts like you and me should look for if we can only buy one carbon disc wheelset. You can train with it at speed on various terrain, enjoy friendly competition against your buds riding hard on group rides, and do long-distance events in comfort. It doesn’t have any obvious weaknesses.

Its glossy finish and branding look good without being loud, it has a strong warranty and dealer network, and it’s priced in the same ballpark as other, less well-rounded alternatives.

The RSL 51’s specs are all modern without offending anyone. It uses the updated model of the well-established DT Swiss 240 hubs (Ratchet EXP) and has rims that are wider than most all-around carbon disc wheels (23.2mm internal, 30.7mm external), as deep as most go these days (51.1mm), and are hooked for riding with tubeless or clincher tires.

And at 1441 grams on my scale with taped rims rather than the weighty plastic rim strips installed, they are marginally lighter (about 20 to 120 grams) than most in this category.

No, the RSL 51 will not outperform a climbing wheelset going up alpine roads or aero wheels in crit race or the best gravel wheels riding off-road. For that, you’ll need all-around wheels with those strengths but other weaknesses or wheels designed uniquely for those types of events or terrain.

Bontrager RSL 51 disc brake wheelset

The Aeolus RSL 51 on Nate’s Venge

But, for an all-around carbon disc wheelset, my fellow testers Nate, Miles, and I found the Bontrager Aeolus RSL 51 TLR do climb quite well. Descending at high speeds is also a confident experience thanks to their excellent handling and unfazed reaction to side winds.

That good handling extends to flat roads where the RSL 51 tracked well through corners paired up with the 28c Bontrager R3 Hard-Case Lite and 25c Michelin Power Road tubeless tires we mounted on them.

Acceleration is another one of RSL 51’s strengths. Combined with their handling skills, this makes for a very responsive wheelset, important when keeping up with moves on a group ride and staying out of trouble in a paceline.

Despite their few mm of added depth, we didn’t find they were any faster or held their speed any better than other all-around disc wheels we’ve tested. And while they accelerate well and are stiff enough for mere enthusiast mortals like me, they aren’t the kind of max stiffness wheels you want for the kind of > 1000-watt sprints you might do in a crit. Bontrager does make wheels for that (see my review of the RSL62), but these aren’t them.

On long rides, the RSL 51 is quite comfortable and better than most in this category. The new DT240 Ratchet EXP hub is louder than its predecessor when freewheeling but not overly so and it’s a relatively low-frequency sound that I don’t find annoying.

At US$2700, £2100, €2500, the Bontrager Aeolus RSL 51 certainly isn’t cheap but is one of the better all-around wheels we’ve ridden. Using these links, you can order them from Bontrager and Sigma Sports.


The Cadex 50 Ultra’s stiffness is central to its performance. My fellow tester Miles, a P12 road racer, and I, a B-group rider, took advantage of that stiffness in a range of ways during our tests of this wheelset.

Miles used it to cover a lot of accelerations in road races and crits. During one 65-mile road race filled with surges, a promising break went away that he didn’t initially get into. He used the Cadex 50 Ultra’s stiffness on an uphill kicker to close a 10-second gap to that group.

The wheelset inspired confidence in both of us with its quick handling and precise cornering. For Miles, he could more easily pick his way through traffic in crits and dive into downhill corners in lumpy road races.

I was able to avoid a crash thanks to the Cadex 50 Ultra’s cornering precision. The rider I was following over-cooked a downhill turn and I cut a tighter radius on these wheels to safely get inside of his arc. I’m not sure I could have pulled that off with most wheelsets I’ve tested.

Add strong climbing to the list of this wheelset’s assets. Its stiff and relatively lightweight combination of rims, hubs, and carbon spokes (1402g as measured with an HG freehub) undoubtedly contributes to its ability to go uphill.

But, the Cadex 50 Ultra also has liabilities that limit its performance beyond road races and criteriums on rolling terrain.

While it helps get you up to speed very quickly, this wheelset doesn’t carry your speed as well as other, high-end race and all-around ones.

And on even moderately windy days (10 mph/16kph), I found the Cadex 50 Ultra front wheel moving all around. Perhaps they do better at higher speeds, as Miles didn’t take issue with their crosswind stability riding this wheelset during his spring training and racing season.

We both agreed that these aren’t very compliant wheels, the kind you’d find comfortable over a 3+ hour ride. As a hookless wheelset that’s wide enough (22.5mm inside width) to ride in the mid-50psi range with 28mm tubeless tires (we used Continental Grand Prix 5000 S TR) for our similar 150lb/68kg or so weight, this Cadex’s compliance was disappointing.

At 60psi, the ride was harsh. Below the low 50s, it was mushy. And at the pressures in between in search of the best combination of comfort and handling, you still feel everything through the wheels, though they don’t jolt you.

Blame the below-average compliance of the Cadex 50 Ultra on the carbon spokes Cadex uses to give it above-average responsiveness and handling. While I’ve not tested them all, I’ve yet to ride a wheelset with carbon spokes that are both laterally stiff and vertically compliant.

Cadex 50 Ultra free hub

Pretty but loud HG micro spline freehub for 12-cog Shimano cassette is also 11-cog compatible.

The freehub Cadex uses on the 50 Ultra is also louder than most. When I apologized for it to the rider in front of me in a paceline, he immediately responded, “Yeah, what is that?”  While some cyclists like an audible freehub, the Cadex 50 Ultra is more vocal than a Chris King or i9 and right up there with the most boisterous of those used on the less expensive wheels coming from Chinese factories.

If you regularly compete in lumpy, punchy races where quick maneuvering and repeated accelerations are key to your performance, the Cadex 50 Ultra is a good option. For a broader range of riding and racing, there are better choices in the all-around performance wheelset category.

The Cadex 50 Ultra wheelset retails for US$3500, £2650, €2850 and is available from BTD (BikeTiresDirect) and Cyclestore.


Like most Campagnolo kit, it’s hard not to be taken by the stunning beauty and engineering precision of the Bora Ultra WTO 45 wheelset. The rich black rim finish, hourglass hub shell, recessed spoke nipples, and modest yet proud graphics draw you in.

As with anything as alluring as this wheelset, I was hopeful that its performance would be just as beautiful and precise.

In some ways, it is.

Judging from how little effort is needed to get it up to speed, the Bora Ultra WTO 45 feels like a fast disc brake wheelset. It doesn’t hold that speed as easily as an aero wheelset or the fastest all-around wheels do on a flat or rolling course. But, the lively and responsive feel of this Campy makes it feel quite fast when you accelerate from a stop or out of a corner.

Campagnolo Bora Ultra WTO 45 carbon disc wheelset

The hubs, flanges, axles, and spokes are as beautiful as the rims

The Campagnolo hubs roll incredibly smoothly, and the freehub is absolutely silent. I felt alone with my thoughts doing a soul ride or set of hard interval workouts on the Bora Ultra WTO 45. For me, that’s generally a good thing. However, if you prefer being accompanied by the sounds coming out of your freehub or drivetrain, you’ll not get that kind of collaboration from this wheelset.

Equally distinctive, and perhaps more importantly, climbing well is a true partnership with these Campags. They go up ramps and steeper pitches with relative ease.

At 1445 grams on my scale with valve stems in place, the Ultra version of the Bora WTO 45 actually weighs about 70 grams less than the non-Ultra model of the Bora WTO 33 we’ve reviewed. While it doesn’t weigh as little as a pure climbing disc brake wheelset, the Ultra 45’s feel as energetic going uphill as one that is.

In addition to its climbing ability, the Bora Ultra WTO 45 wheelset is quite responsive and tracks with great precision through corners. It’s a laterally stiff setup that accelerates well when called upon. My fellow tester and competitive racer Miles found them extremely stiff compared with the other wheels he’s ridden with “zero flex” sprinting on the flats or up a steep climb.

Campagnolo Bora Ultra WTO 45 all around wheels

Our test period included several days when the wind blew 15mph/25kph. In those conditions, you must work with even the most stable all-around wheels to keep things upright. Coming from the side at those wind speeds, the Bora Ultra WTO 45 also gets pushed. The front wheel leans steadily away from the wind rather than with an erratic reaction. Counter-steering in the direction of the wind got me through it.

But on milder days when the wind isn’t blowing that strong or steady, it slices through the winds and gusts quite well with no steering or stabilizing adjustment required.

While sufficiently comfortable for a race-oriented wheelset, especially with the 25mm Veloflex Corsa TLR tubeless cotton (puncture belt equipped) tires we used for this test, you can’t easily optimize them for both speed and comfort on all paved surfaces given their 19.0 mm inside, 26.3 mm outside rim dimensions.

The 25mm Veloflex and Continental Grand Prix 5000 S TR I mounted to these wheels both measure sufficiently narrower than the rim width, even at 80psi. That will give you ideal aero performance over the lifetime of the tires. The other 25mm tubeless tires and all the 28mm ones we installed on this wheelset are or will become wider than the rims and add aero drag (see measurements here).

With 25mm tires installed and at the pressure required for that width tire and your weight, Miles and I didn’t find these Campys to ride either plush or harsh. They were comfortable enough even on the 80-mile ride Miles took them on and not a noticeable benefit or drawback on the many 2-hour rides we each did.

If comfort is more important than speed or the road surface you ride is better with a wider tire inflated at lower pressure, you can certainly use 28mm tires on these wheels and perhaps make up for the added aero drag with reduced vibration loss rolling resistance depending on your speed and riding surface. But be careful not to drop the pressure too low to avoid pinch flatting or rolling the tire in a hard cornering maneuver on these narrower wheels.

Campagnolo Bora Ultra WTO 45 carbon disc wheelset

The hidden, recessed spoke nipples accessible from the outside of the rim are an “engineering detail” worth marveling about

I’ll admit to becoming somewhat spoiled riding a tubeless, carbon disc wheelset with 23mm to 25mm inside rim widths and/or outside 30mm+ ones that are well suited for 28mm wide tires. While there’s a good deal of science behind how wide wheels and wide tires can make you faster, I like to think of it as having my reduced aero drag and rolling resistance layer cake and comfort icing too.

US brands ENVE, Bontrager, and Zipp have been among the larger wheelmakers in this wider rim movement. The major EU brands Campagnolo and DT Swiss have stayed with narrower rims across their best-performing, mid-depth, and aero wheelsets. Likely tracking the introduction and acceptance of disc brake bikes in these regions, Campag and DT also continue to make the most of their top wheelsets in both disc and rim brake models.

I’m old enough to remember that narrower wheels can go fast too. Riding the Bora Ultra WTO 45 indeed reminds me of that when it comes time to accelerate or head uphill. At US$3000/£2700/€3000 at BTD (BikeTiresDirect), Merlin, and BikeInn, depending on the freehub you use, I’m also reminded that it’s a beautiful, iconic Campagnolo brand wheelset that you’re paying for.

Without going deep into all the tech and spec details (performance is our jam at In The Know Cycling), know that you can get the non-Ultra version, aka the Bora WTO 45, for a good amount less. While it has essentially the same rim profile, it’s made with a different mix of carbon and resin, uses a different molding process that requires some post-molding filling and finishing and uses alloy hub shells. It weighs about 100 grams more, most of that in the rims.

The Bora WTO 45 disc brake sells for about US$2500/£1700/€2250 depending on your freehub choice. Use these links to BTD (BikeTiresDirect), Merlin, and BikeInn.

And if you’re as loyal to your rim brake bike as many are to all things Campagnolo, the Bora WTO 45 rim brake model shares many of the same attributes (rim profile, hubset, finish) as the disc brake version and Campagnolo rim brake wheels have long been known for the excellent brake track performance. It’s available for about US$2100/£1675/€2030 at this link to Merlin.


The DT Swiss ERC 1400 DICUT 45 is the endurance rider’s all-around wheelset.

While not a standout on any particular performance characteristic, it does everything my fellow testers Nate, Miles, and I look for from an endurance wheelset.

Riding the ERC 1400 on 50-mile group rides, I can confidently accelerate, climb, pull, corner, and comfortably roll along in the paceline.

Miles likes this DT Swiss wheelset’s ability to do almost anything on the road. While not the fastest wheelset in the kind of sprint, gap-closing, or long, hard efforts where Miles excels, it hangs in there against other all-arounders in the performance-carbon price range on his fast rides and races and performs notably better than value-carbon, mid-depth wheelsets he’s ridden in similar situations. 

You can use clincher or tubeless tires on the ERC 1400’s rims that measure just a bit over 22mm wide between the bead hooks. Using 28mm Continental Grand Prix 5000 S TR tubeless tires with sealant on these rims, Miles and I found the wheels most comfortable at inflation pressures 5 to 10 psi lower than suggested by calculators like the SRAM Tire Pressure Guide.

The rim designed by their partner Swiss Side is straightforward – the same front and rear wheel dimensions, not overly wide (28.5mm external), and with a standard V-U rim profile. Yet, the ERC 1400 remains reassuringly stable in side winds, as good as those using unique designs to keep you riding steadily on a windy day.

And while it doesn’t roll as fast as other, slightly deeper, and differently shaped all-arounders like the Zipp 454 NSW or ENVE SES 4.5 and isn’t as responsive as lighter, stiffer wheels in this category like the Cadex 50 Ultra or Campagnolo Bora Ultra WTO 45, you do feel the power you put into the ERC 1400 driving through the wheels when accelerating and cornering.

Of course, the ERC 1400’s other components – the DT Swiss 240 Ratchet EXP 36 hubs and aero comp straight pull, bladed spokes – and the company’s reliability track record are all part of the package. The latest 240 freehub coasts a bit louder than its predecessor but isn’t as loud as the pleasing sound of a Chris King freehub or as noisy and annoying as those on lower-priced wheels we’ve tested from Hunt or Scribe.

If you are looking for wheels to race on, you might want more performance – snappier, better at holding your speed, lighter on climbs – than what the ERC 1400 offers. You’ll surely pay more for them.

At the other end of the range, if you are principally a recreational cruiser, you might want a more comfortable and forgiving wheelset. While you wouldn’t likely get the versatility and all-around performance of the ERC 1400, you could find that comfort at a lower price point.

But if you are an endurance rider, keeping up a good pace on half or all-day rides across a variety of road terrain, you’ll find it hard to beat the combination of things the ERC 1400 does well at the price it sells for.

You can order the DT Swiss ERC 1400 DICUT 45 for US$2400, £1800, €2325 at REI, Sigma Sports, and Amazon. 

Note that DT Swiss makes an ERC 1100 DICUT 45 with a 180 hubset instead of the 240 used in the ERC 1400. It also sells 35mm deep versions of the ERC 1100 and ERC 1400 in 700c and 650b rim diameters


The Roval Rapide CLX II presents enthusiasts with an existential question about our cycling: is it our purpose to ride like we’re racing or ride like we’re having serious fun?

Of course, the two can sometimes be the same.

But riding in race mode is about getting to the finish first, whereas riding in serious fun mode is about having as much fun as anyone.

I raise this question because, for me, the Roval Rapide CLX II performs differently on several criteria depending on whether I use a 26mm tire that Roval recommends to optimize this wheelset’s aero performance or a 28mm tire that I generally prefer to ride for overall performance (i.e., versatility, aero, stability, stiffness, compliance, responsiveness).

To evaluate the Rapide CLX II wheels, I used Specialized’s 26mm S-Works Turbo RapidAir 2Bliss Ready T2/T5 (or “RapidAir”) and their 28mm S-Works Turbo 2BR 2Bliss Ready T2/T5 (or “2BR”) both introduced by Roval’s parent company on the same day as the Rapide.

Roval Rapide CLX II

Note that the Rapide CLX II is a tubeless-ready carbon disc wheelset, whereas the CLX was not approved for tubeless tires. While you can use clincher tires with tubes on these CLX II wheels as they have hooked rims, the best tubeless tires with puncture protection belts, including the RapidAir, have lower tire loss rolling resistance than clincher ones in drum testing that simulate road conditions.

Using these Specialized tires was the closest I could come to comparing the Rapide wheels with the same tires at different widths. They don’t (yet) make a 28mm size in the latest version of the RapidAir. And the 28mm 2BR uses the same compound as the RapidAir, just with an additional casing layer.

Yes, I did test the Rapide CLX II with 28mm wide Continental Grand Prix 5000 S TR tires but not initially (more on this below). In part, that’s because Roval and Specialized designed these wheels and tires to work together (Rapide & RapidAir). Also, the prior generation RapidAir was one of my and fellow testers’ highest-rated tubeless tires across a range of wheelsets. In my judgment, the new RapidAir remains one of the best.

Interestingly, I can’t tell any difference in how well the Rapide holds its momentum for a given level of effort at speeds above 20mph/32kph – my surrogate for aero performance – with the 26mm RapidAir vs. the 28mm 2BR tire in warm temps. And neither does as well as the ENVE SES 4.5 (with 28mm Schwalbe Pro One TLE tires ) or Zipp 454 NSW (with a 25mm front tire, 28mm rear Schwalbes) against this performance criterion.

With the 26mm RapidAir tires mounted, the Rapide CLX II feels light and reactive. The wheels are very lively accelerating on a straight, coming out of a turn, and heading up a hill. They are very responsive and both fast and fun in these situations, nearly as much as the category-leading Zipp 454 NSW.

With the 28mm 2BR, that responsiveness is muted a bit and more on par with the average all-around wheelset. Is it the added 60g/tire of the 28mm tires? I don’t know, but I doubt it. The 28mm 2BR weighs essentially the same as the prior model 28mm RapidAir and only about 35g/tire more than the 28mm GP5K S TR. And aero is just as important as weight in acceleration. So maybe it’s just that the 26mm tires are a more aero setup.

The Roval Rapide CLX II’s compliance and handling are notably better, however, with the 28mm tires. No hot take there. A 10psi lower pressure and a wider contact patch undoubtedly explain that.

Regardless, the Roval Rapide CLX II’s “race-feel” comfort with 26mm tires (the setup I use to compare the Roval’s performance criteria against other wheelsets in this category) is on par with the average all-around wheelset and is certainly fine for the 50+ mile rides I did on these hoops.

I initially tested the Rapide carbon disc wheels during the late summer and fall months when there were enough days of 10-20mph, often swirling winds, to really put the wheels’ sidewind management to the test. And they performed admirably, as stable as the ENVE 4.5 and Bontrager RSL 51.

Curiously though, I did feel a few rather erratic tugs on the front wheel with the 26mm tires mounted on days when the winds were their strongest, something I never felt with the 28mm tires on similarly windy days. The tugs weren’t often big enough to make me back off of my pace; it was just something I took note of.

While I don’t know if it is related, the Specialized tire product manager did tell me their testing showed the 26mm tires were more aerodynamic on the Rapide wheels in head-on winds while 28s were more aero in crosswinds, though he wouldn’t share any details of the aero differences, wind angles, or testing protocol.

Roval Rapide CLX II

The 26mm RapidAir inside the 35mm wide Rapide front rim from two angles

Looking at the wheels while riding along in the saddle, both size tires appear rather odd to me in the Rapide’s front rim. That rim measured 34.9mm at its widest. I’m sure there’s some engineering (or perhaps, marketing) explanation for the front wheel’s width, but it’s still weird.

The rear is a more “normal” 30.4mm outside, while both rims measure 21.0mm between the hooks.

And, like the ENVE SES wheels that started this whole trend, the Roval Rapide CLX II’s front wheel has a blunt nose spoke edge and measures 51.5mm deep, while the 60.3mm deep rear has more of a traditional V-shaped spoke edge and a toroidal rim profile.

The following spring, I mounted up the 28mm Continental Grand Prix 5000 S TR tires on the Rapide CLXII. They clearly felt faster and more responsive than with the 28mm 2BR and gave me the added comfort and handling you get over a 26mm RapidAir.

Until Specialized comes out with a 28mm RapidAir, which I expect they will do eventually, I’d recommend riding the 28mm Conti tires over the 26mm RapidAir with this wheelset in both race and fun mode.

Finally, I’ll note three other considerations that may affect your decision about buying this wheelset.

First, I needed to use tire levers to install the Specialized, Continental, Schwalbe, and Michelin 25/26mm and 28mm tires included in my best tubeless road tires review on the Roval Rapide CLX II front and rear rims. In most cases, I don’t need to use levers with the eight rims of varying inside and outside widths I use to compare the ease of tire installation.

While I can’t measure it, I can only guess that Roval makes the Rapide CLX II wheels to the larger end of the rim diameter standard, aka the ETRTO and ISO 622mm ±0.5 mm rim bead seat diameter tolerance range, or has a shallower center channel. If so, that’s not unsurprising, considering that Roval’s first attempt at making a tubeless Rapide (the Rapide CLX) created an unacceptable chance of tubeless tire blowouts due to claimed structural issues in the rim.

So, perhaps they are being more conservative with the Roval Rapide CLX II dimensions to create a tighter fit between the tire and updated rims, something I can’t fault them for. And, needing to use a tire lever is a minor inconvenience rather than a deal breaker.

Secondly, the DT Swiss 180 Ratchet EXP internals used in the rear hub on this new Roval Rapide CLX II carbon disc wheelset make its freehub pleasantly quiet while coasting with a well-maintained chain. That’s different than the DT Swiss 240 EXP freehubs that are more commonly used on carbon disc wheels these days and are far louder than their nearly quiet DT 240 predecessor, though not annoyingly so.

So, you’ve got choices with the Roval Rapide CLX II depending on your purpose in life cycling and commitment to Specialized tires. You can race with primo aero performance and responsiveness on 26mm Specialized RapidAir tires. Or, you can ride fast and have serious fun on the same wheels with 28mm Specialized 2BR tires for better handling, crosswind stability, and comfort.

Or, you can let your mind and legs decide which mode you want to ride in with the 28mm Conti GP 5K S tires now and likely the 28mm Specialized 28mm RapidAir if and when they are introduced.

Either way, the Roval Rapide CLX II sells for US$2800, £2250, €3000. That puts it in a similar price range as the ENVE and Bontrager all-around wheelsets. You can order the Rapide using these links to recommended stores Performance Bike, Sigma Sports, and BikeInn.

If you generally like what the Rapide represents but want to save a boatload of money, the Roval Rapide CL II – no “X” in the name – is another option.

The CL II sells for $1750, £1400, €1800, considerably less than the CLX II. It uses the same rims as the CLX II but is equipped with slightly heavier and less aero yet still very capable and always quiet DT Swiss 350 hubs and lower spec, round DT Competition Race spokes instead of the more aero, bladed DT Aerolite on the CLX II.

I haven’t tested the CL II but based on the hub and spokes used, likely not as fast or responsive as the CLX II.

The Roval Rapide CL II is available using these links to Competitive Cyclist, Performance Bike, Sigma Sports, and BikeInn.


Carbon disc wheelsets are a fast-growing and fast-changing category of cycling gear. The generation chart displayed near the top of this review shows how much has changed in the last few years.

In this post, you’ve got the latest, best, all-around depth, carbon disc wheelsets that are widely available to consider in this category. Several others are sold in low volumes or supported only within a limited geographic region or both.

There are several wheelsets whose depth might suggest they might fit in the all-around category. This includes the ENVE SES 3.4, the Bontrager Aeolus RSL 37 Disc, and the Zipp Firecrest 303 Disc and 353 NSW. From our testing, you can certainly use them as all-arounders but they aren’t as fast on the flats and rollers as those in this review and are better as dedicated lightweight, climbing wheels. You can see my reviews of them here.

There are a growing number of deeper, mid-depth aero (55mm to 65mm) carbon disc wheelsets you can read about here. While specializing in high-speed riding, few approach the versatility of all-around road disc wheelsets reviewed here.

*      *      *      *      *

Thank you for reading. Please let me know what you think of anything I’ve written or ask any questions you might have in the comment section below.

If you’ve benefited from reading this review and want to keep new ones coming, buy your gear and kit after clicking the store links in this review and others across the site. When you do, we may earn an affiliate commission that will help me cover the expenses to create and publish more ad-free, subscription-free, and reader-supported reviews that are independent, comprehensive, and comparative.

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Thanks, and enjoy your rides safely! Cheers, Steve


  • Hi Steve,

    The ENVE 4.5 AR disc wheelset does not fit on many road bikes. My Dogma F10 Disk is one of them. What is your opinion of buying ENVE 3.4 disc wheelset as an all around? My average speed when I go outside is between 24 to 30km/h. I am torn between Enve 3.4 and Campagnolo WTO 45.

  • New contenders now. Bontrager RSL 51, 62 and 75. Zipp 353 NSW. Holy, the Zipp ones are expensive.

    • Charlie, Indeed. Follow me on Facebook, Instagram, and Twitter and you can see that we are testing the Bontrager RSL 51, Zipp 353 NSW, and a bunch of other wheelsets and gear now. Steve

      • Still waiting for a review of the Royal Rapide CLX 51-60 wheelset. I find it to be a great all around performer.

        • Don’t hold your breath as they are not tubeless compatible

          • Craig, I have nothing against clinchers but I do prefer tubeless. Both work. I’m interested in checking out the different front and rear rim shapes and how they perform together. Certainly works for ENVE but this is unique for Roval. Steve

        • Ed, I’ve been trying to get a hold of the Rapide CLX since they came out. No luck yet. But your feedback will fill the gap. Thanks, Steve

  • Hey Steve,

    Thanks for the review on the RSL 51’s. How would you compare them against the Reynolds aero 46?

  • Would you view the Zipp 454 NSW as having all the same strengths as the Zipp 353 NSW but also the fastest amongst this peer group?

    • Hi Clark, we’re riding the 454 NSW (and 404 Firecrest) now and will post reviews end of the month. Steve

  • Hi Steve
    Thanks very much for this review – absolutely fantastic. I am considering the Enve 4.5 AR for a Factor Ostro build, wondering if you have any views on the Black Inc 45 or whether you will do / have done any reviews of the Black Inc wheelsets?
    Thanks, Kieran

  • Steve, are the 33mm deep Campagnolo WTOs really as aero as the new 51mm deep Bontragers, especially as they are rather narrow and won’t come anywhere near the rle of 105? They score the same in your table.

    • Colin, Thanks for your comment. Aero performance is hard to nail down as a) I don’t have a wind tunnel b) a wind tunnel doesn’t accurately simulate what happens on the road, and c) we ride “all-around” wheels across different terrain, with different tires, and at different speeds.

      For this performance measure, I and my fellow testers have historically used this description to rate what I inaccurately call aero performance and is probably better described as speed performance – “how much you notice a difference in speed and your ability to hold that speed with much less work when you are well underway on flats and downhills.” It’s obviously subjective but tends to show up in the ability to hold your momentum at aero speeds and how smooth the hubs roll at those speeds. Nate, Miles, and I can feel those things out on the road especially after riding so many different wheels on the same roads over the course of a few seasons.

      I’ve typically put my top-rated tubeless tires on each wheelset to neutralize the potential effects of tire width and rolling resistance differences. Fortunately, my previous top-ranked tire (Zipp Tangente Road Tubeless) and current one (Bontrager R3 Hard-Case Lite TLR) have tended to run narrower than most rims and within the Rule of 105 for the 25C models and on some wider rims with the 28C size of those tires. As the wave of wider tires and rims continues, I’ve put a lot of time and emphasis into measuring different combinations of both at 25C and 28C widths to help people make tire choices that maintain their wheel’s aero performance.

      All of that said and prompted by your comment, I went back and looked at all the rim-tire combinations with the wheels in this review. Using the 25C or 28C top-rated tires depending on the rim width, all but the Campy Bora WTO 33 pass the Rule of 105 (with adjustments for new tires – Rule of 108 – or hookless rims – rule of 102 or 103. See the tubeless tire post for more on all these rules.) The Campy likely would with 23C tires but no one rides those anymore.

      And as you suggest, it’s pretty likely that a 33mm deep wheelset isn’t as aero as a 51mm deep one even with a tire that fits under the rule of 105. I know I was super-impressed with how smoothly the Campy hubs rolled. That and my laziness to look closer at the rim-tire ratio in the aero ratings until now likely caused me to overrate it.

      I’ve adjusted the Campy aero rating now, confirmed the others and I thank you again for spurring me to do this with your comment. Cheers, Steve

      • While they are the 45’s not the 33’s Tadej Pogacar seems to do pretty well on the Bora’s 🙂

      • Steve, thanks for such a detailed explanation, I appreciate you taking the time. What you have said makes “real world” sense to me and makes it easier to undertsand your ratings. Keep up the good work, I find this site extremely useful and as such I have made a contribution. Well worth it.

  • Will you be testing the RSL 62?
    I am debating whether to get the RSL 51 or 62. I am more of a sprinter and am mainly racing in flat and mixed terain, but I wonder if the better acceleration of the RSL 51 due to their lower weight and thus saved energy at the end of a race isn’t more beneficial in comparison to the energy you are saving whilst just riding along with 1-2 W less + 4-5 W advantage in an all out sprint at the end of a race.
    For record, I am riding a Reynolds Strike Disc wheelset right now and these feel fine, but I think they are pretty heavy vs. top-of-the-line wheelsets.

    • Mike, We will be testing the RSL 62 starting later this week and likely have a review out by mid-September. Generally speaking though, weight is less important than aero until you get up over 7% grades. The amount of weight difference between those two wheels is also relatively small (125g or so) and there are many other ways to make up the energy losses – correct tire width, inflation pressure, weight on your bike (and person), etc. The Reynolds Strike is another 200-250g or so more than the RSL 62, an amount you’ll notice for much the same depth.

      Those are all just specs. How they actually perform on the road is what we’ll be testing out and reviewing. Steve

  • Hi, great new and updated wheel sets table.

    I am contemplating the new RSL 51, however i also have availability on some Campagnolo 45 WTO 45’s or 60’s

    The WTO’s and RSL are currently premium priced but given your great feedback on the Bontrager XXX 6, are those still comparable and great for flat/aero ?

    Im mainly flat and heavy rider at 90kg

    The Bontrager xxx6 disc are on sale in UK with a saving of 30% compared the WTO’s and RSL’s

    • Eric, Well, the XXX 6 wheels haven’t gotten any slower! We’ve just started testing the RSL 62 so I don’t have any feedback yet. We haven’t tested the Bora WTO 45 or 60. But you can see how the XXX 6 compared against other aero wheels in my review of that category here. If you are riding at aero speeds on mostly flat roads, the XXX 6 is still a good choice and especially good if you can get it a discount from a dealer you can trust. Steve

      • Thank you so much Steve.

        Fantastic, im looking forward to reading about the RSL 62’s.

        Your content and ‘real life’ test and reviews are always appreciated and welcomed.

        Funny , the comment you made about XXX 6 , yes they have not become any slower and I think still quite modern in their rim design and profile.

        Again, thank you for a really good web site and your content. You are a true passionate in keeping this up.

  • Do you have any guidance on selecting between 3.4AR and 4.5AR? I do a lot of climbing and a lot of rolling flat riding. I want AR flexibility but I can’t overlook the fact that climbing qualities matter. My brain says 3.4AR, but your overwhelmingly positive review of the 4.5AR makes me second guess that.

    • Tom, depends on what you mean by “a lot”, “climbing” and “flat riding”. May I suggest you check out my post about how to pick the best wheels for you ( to see if you really need climbing wheels or will benefit from deeper wheels or something that is more all-around (including riding “all roads”) like the 4.5 AR but isn’t optimized for any of them. Steve

  • Hello Steve, I’ve thoroughly read your various reviews n wheelsets, both Aero as well as all round and climbing.

    Now having accrued my much desired deep aero sets (WTO 60 and xxx 6)

    So for my all round bike id like an all round wheelset.

    I love the feel and look of the Campagnolo wto, and as such reading your review of the wto33 makes those very interesting.

    Are they in fact so good for all round as you describe? At first you even had a good aero rating…and they are still in the all round category (rather than climbing).

    Having the deeper aero sets already, i thougth this particular 33 could fitin very well both for all round and climbing given your feedback.

    At what point does ‘depth’ provide any form of benefit , 30-40 or 45mm?

    • Hi Erik, Thanks for reading and for your question. That’s a hard question to answer with an absolute depth number as there are so many variables that can affect aero performance. The major determinants of aero performance, of course, are your own cda as determined by your body size and position and that of your bike. And there are many ways to improve aero that cost you less than a wheelset from your helmet to your shoes and include such simple things as shaving your legs and shedding your gloves.

      Likewise, there are ways to ruin whatever aero performance you hope to get from your wheels by using tires that measure any more than about 95% the width of your rims once installed and inflated. And then, while aero is more important than rolling resistance starting at around 12mph/19kph, it really starts to kick in around 18-20mph/29-32kph and its importance rises logarithmically from there. But using a tire with poor rolling resistance relative to others you could use or inflating it beyond where you need to reduce vibrational losses and improve handling, grip, and comfort will also add watts and reduce the speed benefit you hoped to gain by improving aero. Then there are likely significant losses to be recaptured by keeping your drivetrain clean and lubricating the chain better.

      You likely knew all of that from your reading. I repeat it here for those readers of your question who may not have read the aero wheelset reviews or my 2 part post on how to ride faster on your bike.

      As to the wheels themselves, it varies between wheelset profile and manufacturer almost as much as it does between depth. While the conventional wisdom these days is that there’s little aero difference between wheels of the same depth, that may be true for the wheelset makers that put a fair amount of R&D into their product and not so much for others that don’t or merely copy the leading rim profiles. The data isn’t conclusive nor is the way to test (wind tunnel vs. real world, steady state air vs. transient state air, rider on the bike vs wheel alone, same tire on all wheels tested vs only tires that are a certain percentage of the rim width, etc., etc.)

      Since I can’t speak for the aero performance of each wheelset we ride in a quantitative way, my ratings are a subjective measure of how the wheelset holds its speed or maintains its momentum underway. My fellow testers and I do this at different speeds, typically between 20mph and 25mph (32 and 40kph) using benchmark tires, inflation pressures, and other consistent riding and gear methods. It’s subjective, it’s comparative, it’s more like what enthusiasts will experience than pro racers, etc. There are a lot of variables – wind, weather, riders, etc. – it’s not scientific. But, after doing a lot of it for a lot of different wheels, when we notice the difference, we report it that way. I think this is more typical of what enthusiast riders will notice than what a lot of the manufacturer-reported data that says such and such is x% or y% better than the last generation of the wheelset.

      With all that as preamble, my fellow testers and I notice that most 60mm deep wheelsets will hold their speed better than most 50mm deep ones and 50mm more than 40mm ones. But some 50mm wheels will hold as well as 60mm ones. And that’s why we do the ratings.

      Below 40mm and even for a lot of 40mm and even some at 45mm, most don’t hold their speed very well at 20+mph/32+kph. Also, all-around wheels seem to be getting deeper and lighter with 50mm and sub 1500g the current performance benchmark whereas it used to be 45mm and 1500-1600g. The deeper the wheels, the more aero the wheels or the better they hold their momentum, all else (e.g. tire width, pressure, choice, etc.) being equal and not in conflict with aero performance.

      The other thing we’ve noticed is that climbing wheels seem to be getting deeper and deeper climbing wheels are getting lighter without being any more affected by crosswinds despite their added depth.

      And the other, other thing is that some wheels in the mid 50mm depth range are as or more aero than 60mm wheels and as or more “all-around” than 45-50mm all-around wheels. That’s what you’ll find in the reviews. I ride mid 50mmm deep wheels as my all-arounds.

      Unfortunately for the Campy WTO 33, it’s neither as light (or as deep) as most or the better climbing wheels nor as aero as most all-around wheels. It has other attributes that favor it as I wrote about in my review but it doesn’t compare well on many performance criteria against all-around wheels. Crosswinds aren’t an issue for most modern all-around wheels from leading suppliers but the 33mm depth will assuage the concerns of some who do their all-around riding in continuously windy regions. I’ve not had a chance to ride the WTO 45 but I think it would likely compare better to others in the all-around category.

      Hope that helps. Steve

      • Wow , Steve, thank you so much for a very detailed and in depth analytical answer(s).

        I will consider all of the above prior to even consider the need/want for another mid range depth wheelset.

        There are so many variables and it is true, the benefit of a new wheelset may be negated by other not considered aspects….or on flip side, not at all needed if other cycling accessories and aspects are prioritised.

  • Hi Steve

    I’m in the market for a good value wheel set in this category whilst trying not to compromise on the rule of 105 using 28mm tires due to weighing 185lbs and riding in the UK. I also want the wheels to be 50mm deep as I already own some 35mm wheels. This had led me towards the RSL 51 wheels, due to the wide rim width, reasonably low weight and price.

    I’ve noticed however that the Bontrager Aelous 51 Pro wheels look identical to the RSLs except for a slightly slower engagement / heavier hub and type of carbon resulting in about 160g extra weight. They also retail for £1200 instead of £2000 for the RSLs which is a big price difference for what feels like a small performance increase.

    I feel 160g is insignificant for me as a heavier rider who rides on fast / flat rolling terrain with occasional hills. I also feel like the faster engagement of the hub with the dt240 vs dt350 hubs is probably not that significant a difference. Are the Pro version going to be less stiff than the RSLs? Is there anything else I have missed here or are there better options for me that I am not considering?


    • Jamie, I think you’ve got that mostly right. Extra weight comes in the rims (120g) where it matters and hubs (90g) where it doesn’t. Hub engagement is the same and while the DT240 rolls a bit smoother, the DT350 is a bit quieter. Both work fine. Biggest difference likely comes in the carbon which will, in theory (I haven’t tested the Pro) be less stiff and responsive/snappy. But, for the kind of riding you are describing you do, only the potential stiffness difference would matter in transferring your power less efficiently when you do big accelerations.

      The Pro is available US Trek/Bontrager site here for US$1500 but is out of stock on the UK site. Steve

      • Steve

        Thanks for the help!

        I’ve also read your review of the Zipp 404 firecrest wheels and am very tempted by them. My only worry is that weighing in about 180-185 lbs, the recommended tire pressures make it hard to obey the rule of 105.

        It looks like 25mm tires on the front and 28mm at the back would be borderline ok using their pressure calculator as long as I use tires with “standard” rather than “thin” casing whatever that means? Their tool suggests a front tire pressure of 69.1 psi and 63.1 psi rear with these parameters which is below the 73 psi max.

        Alternatively, I could just use the 28mm tires on both (and use a standard casing option) but I expect this would be above the rule of 105 given their external rim width is 27.5mm and probably make it worth sticking with the Bontrager RSL 51 wheels? Did you try 28mm tires on these and see how they measured up?

        Do you have a recommended set of tires to fit around the pressure constraints or do you think I’d just be better off with the RSL 51s?

        I like the idea of the extra depth with the Zipps.


        • Jamie, Don’t overthink it. We’re talking about a few watts here. There are other ways to increase your speed. Buy the wheels you want and the tires that best work with those wheels and your situation. Steve

  • Hi Steve.

    I have recently purchased the RSL 51 and have been struggling a bit in crosswinds. I live in Newcastle uk and is pretty flat, but often I ride along the coast.

    I was thinking perhaps I should have gone with the NSW (353 or 454) but notice the RSl Actually outperform the 454 on your chart in crosswind.

    Do you think the 353 would fair up much better? Would I be giving up much performance on the flat vs RSL 51. The price of the nsw did put me off but ultimately I could stretch to either if it would give me better performance in the wind without sacrificing much else.

    Perhaps I’m just thinking “the grass is always greener” but without the ability to test ride multiple wheel sets you have to take a gamble on something.

    Maybe I just need to embrace the crosswind a bit more as these are my first deeper wheels coming from the stock bontrager 35mm that came on my bike


    • Iain, It’s a tradeoff. A shallower wheelset will typically be less affected by crosswinds but not be as fast on the flats as a deeper one. That’s also our experience with the 353 NSW and RSL 51. In the case of those two wheels, we felt more of a difference in flat terrain speed than crosswind effects. It comes down to deciding which performance aspect is more important to you and whether you can overcome or manage the drawbacks of a given wheelset. Note that if you want a shallower wheelset, you can do so at a price much lower than the 353 NSW which is a solid wheelset but best as a climbing one. Steve

      • Thanks Steve for your time to respond. From your response I am taking that the rsl 51 is probably not hugely worse than the 353 nsw at crosswind. Rolling speed decrease will be more noticeable than crosswind increase?

        If that’s correct. I think I’ll stick with the 51s and as you say and just become more used to how they react. Im sure they are a great wheel and Perhaps it will just turn out to be a gut/initial reaction from moving to the deeper wheel and feeling slightly uncomfortable with how they were moving. I’m sure I’ll get the hang of it and get more confidence over time.

        I could always get a single rsl37 for upfront for anything particularly windy / climbing days.

        • Iain, yes, that’s what we experienced. Changing wheels can take a little getting used to but I expect it won’t take long. Enjoy, Steve

  • As many others have mentioned this an awesome review and extremely helpful, it is greatly appreciated by a lot of enthusiasts such as myself. I just bit the bullet and bought the 4.5 ARs – I’m awaiting shipment and for the snow to melt (it might be a while) before I get a chance to ride on them. I noticed you didn’t mention if any of the tires you tested on these wheels fell into the Rule of 105 (or 102-103 since they are hookless). Reading your review of tubeless tires it seems the Bontrager R3s should put the combo at about 106% assuming they size up the same as when they are mounted on the 3.4 ARs, did you happen to take measurements of the tires you tested with the 4.5 ARs? I most likely wouldn’t notice the difference in watts out on the road but I was curious.

    • Steven F, Cool. That’s a great wheelset and I expect you’ll really enjoy it. Thanks also for the kind words. The best way to show your appreciation is to buy your gear through the top-ranked stores I link you to in the reviews. When you do, some stores will provide a commission that helps me cover the costs of putting out these reviews and keeping the site running.

      As to tires, look at the chart that shows the measurements of several 28mm tires on similar width wheels. Later this winter, I’m planning to update the measurements and analysis based on some research I’ve been doing the last couple of months. Steve

  • Any plans to test the new Shimano Dura Ace 9270 C50 wheelset? Very curious to see where they fall in this group.

    • Bill, Yes, I’m working on getting a set. Steve

      • Great. The other bit of info I’d love to see about various wheels is how easily popular tires go off and on (like Continental GP5000 clinchers). It’s kind of a crap shoot to see if a particular tire and wheel like each other, and hard to find out until a purchase has been made (i.e. after it’s too late). Also thanks in general for a super informative site. : )

        • Bill, thanks for your kind feedback. Note that one of the criteria I use in my review of the best tubeless tires is their ease of installation. For the latest update finished last month, I mounted 7 tire models (including the Conti GP5K S TR), several in 25mm and 28mm sizes on 8 wheels from 5 brands. That was about 75 different combinations. I no longer include tires that are a beast to mount. I don’t review clinchers that require tubes because they have noticeably higher rolling resistance than tubeless tires that use sealant (or can use tubes) and because many of the newer, better wheelsets require you use only tubeless tires. Steve

  • Hi Steve, Just want to seek your advice. Which one is better Reynolds Blacklabel Aero 46 DB VS Bontrager Aeolus Pro 51?

    • Jade, Just beginning our review of the Bontrager Aeolus Pro 51 now. Note that the Reynolds Blacklabel Aero 46 DB is targeted for a higher performance level than the Bontrager while the Bontrager is intended for a lower price point than the Reynolds. So if by “better” you mean better performance, I expect that the Reynolds will be better. But if by better you mean better value, based on our review of the Aeolus Pro 37, the shallower sibling of the Pro 51, I expect that the Bontrager will be better. Steve

  • Hi Steve,

    Firstly, thank you for putting this information out.

    I’ve read your posts and appreciate that you do not or have not reviewed the latest Lightweight or Corima rims for the reasons you stated. I was hoping to get your opinion as I am looking to “modernise” my wheelsets.

    I run the Meilenstein Evo (48mm) and Fernweg Evo (63mm) tubeless rims from LW along with the MCC DX (47mm) tubulars from Corima. All of my bikes are Pinarello Dogma F12s and Fs for reference.

    I’ve read a lot of views that these rims are of an outdated technology and wanted to get your views on how much of a disadvantage this can realistically lead to? I got them as they just evoke so much emotion.

    I am a masters athlete and most of my group rides are between 50-130km, at an average speed of 36-40km/h. My profile is that of a sprinter (grew up as a national sprinter in the pool) due to my past sporting history and peak at 1900 watts. I am also much more muscular than the typical road cyclist at 175cm & 76kg.

    The terrain available to me is flat and mildly rolling with very minimal gradients exceeding 5%. The climbs that we have exceeding 8% do not last beyond 6-8 minutes here.

    Would you be able to share an opinion on your thoughts on the Lightweight and Corima rims mentioned, whether you have ridden them or just even based on their design philosophy please?

    I am considering getting the new 454NSW and/or the new Enve SES 6.7 if these rims will make a material difference to my performance. If we are talking about <5watt gains then perhaps it may not be worth it. I do think I might gain a lot in terms of comfort and traction from the much wider rim profiles and lower pressures though…

    Thanks again!

    • Adrian, There’s a lot in your question about what’s the best wheelset for you. I will begin offering personalized recommendations as a service in the next couple of weeks and can address your question better at that point. Steve

      • Thanks Steve,

        Is there a way for me to contact you on this? I’ve put a few of those options on hold at the local distributor so I was hoping to be able to get your insight and happy to pay for the service as well.



  • Hi Steve,

    Do you see any plan or chance to test newly revealed Shimano Dura ace C50 Carbon wheelset? I’m very much comparing between Enve SES 4.5 and new Dura-ace C50 and wonder if you will test it?


    • Eric, I do. It’s been introduced but is not available in stores yet. It is due sometime in July so hope to review it by end of summer. Thanks, Steve

  • If you could build up the SES 4.5’s to the same weight as the 454 NSW’s, would you still rate the NSW’s higher?
    To do this would require some fancy hubs (i.e. Carbon-Ti) and therefore, let’s assume the wheels cost the same. So, same weight, same price … which is still king wheelset?
    (Your and your team’s real world and trustworthy reviews are so helpful; I’m seriously considering the club membership. Thanks!)

    • Martin, We don’t actually rate one higher than the other. Sorry if I gave that impression. Both are rated Best Performers. They have slightly different relative strengths summarized in the comparison table but it comes down to personal preference. Amongst Nate, Miles, and me, we are super stoked to ride either of them when we’re not testing something else. Steve

      • Yes, my takeaway from the wording in the reviews is that you had a stronger positive impression with the 454NSW. I had overlooked the rating table on this occasion, my mistake. Now I see they are rated equal best with slight strengths/weakness difference. Thank you.
        Last clarification …. would it be fair to say the 454NSW’s are the best for on-road riding conditions including an equal mix of flat valleys, twisty 10%+ climbs and descents and not significant side winds? Or would you be equally happy reaching for the SES 4.5’s in those conditions?

        • Fair point. I’ll have a word with my editor about that! 🙂 As to your question, I’d probably want a lighter wheel on 10%+ climbs if they were long but it’d probably come down more to my legs and fitness than the difference between these wheels. Steve

  • Thank you so much for the Rapide CLX ii review. It sounds like the wheels are reactive, playful and in similar range as the overall use wheels sets and not necessarily as aero as the depth would imply.

    Surprisingly…or perhaps not, Enve 5.6 and 4.5 still seem to still carry the crown for best overall performances and aero capabilities (RSL62 seem to covet the aero more recently)

    Possibly pending your location In the world and pricing Roval CLXii may be tempting compared to Enve (UK especially) but in UK Bontragers RSL and new Shimano’s are favourable priced options compared to both Enve and Roval

    Thanks again,

  • Hi Steve

    For the Enve 4.5 Disc in Tubular version, do you believe it is as aero dynamically efficient as the hookless version, when considering the tyre to rim interface?

    (My other Tubular wheels seems to have less flush interface than the typical hookless designs)

    • Erik, I’m told hookless is more efficient as rims can control the tire shape better. Tubeless tires also have lower rolling resistance. Steve

  • Hi Steve,

    In overall performance, which one do you recommend Bontrager RSL51 or ENVE SES 5.6?


  • Hello, Steve

    Thank you for your reviews. Great source of information.

    I am planning to have built a new bicycle soon. The base is going to be Fairlight Strael steel frame, going for a long distance machine. My rides are 60-80Km on average with some 150+K days here and there. Usually under 2000m of climbing over 100Km, short and punchy climbs rather than long and steady efforts. The roads around here have mostly half decent to bad tarmac and I ride solo 99% of the time. Looking for one carbon wheelset for fair weather riding so don’t mind paying a bit extra for quality and performance. My only preference is DT Swiss hubs as all the reviews I’ve come across are positive. Plus deeper section wheels (45-50mm) would look better, I suppose 🙂 Are there any wheelsets you’d point me towards?

    P.S.: I use 32mm clincher tires (Schwalbe Marathon Plus)

    Thank you in advance for your reply.


    • Matt, Take a look at the comparison chart If you’re limiting yourself to DT Swiss hubs, the choices are the Bontrager, Roval, and DT Swiss wheelsets. You can see my take on their compliance for consideration on rougher roads. None are super light for climbing. If you are willing to consider wheels with other hubs, and I’ve had good luck with Zipp and ENVE hubs, you have more options to get more of the performance you’re looking for from a higher rated wheelset like the 454 NSW or SES 4.5 Steve

  • Thank you, I’ll look at that comparison.



  • Martin A Navarre

    Hi Steve –
    Tire choice with the 454NSW’s is quite a conundrum. As you can see in your excellent tire rating and selection guide with inflated widths.

    I’ve been running my 454NSW’s with 28mm tires which are visibly a bit wider than the outer rim width. I plan to switch to 25mm tires because I do get some front wheel flutter at high speed – above 70kph. But, according to SRAM’s tire compatibility, the approved 25mm tires generally don’t score well on rolling resistance tests.
    The best compromise I see is the 25mm Schwalbe TT tire … you measured 27.5 at 70psi. So that is an option. I am also considering the 25mm Vittoria Corsa Speed or 25mm Continental 5000 TT TR … but these are not approved on the SRAM list.
    Considering that I run low pressure: 40 – 45psi with 28mm tires and 55-60psi with 25mm tires on another wheel. What kind of risk is there in using a 25mm tire that is non-approved by SRAM? Is there a way to test it myself … i.e. simply inflate to 70psi and check for blow-off. I’m certainly not being flippant with my safety (in fact I’m trying to be more safe by reducing high-speed flutter), but I find it hard to believe that the 28mm Continental 5000 TT TR is safe but the 25mm is not.

    • Martin, A few things. SRAM’s tire compatibility chart is based on what tire companies have told SRAM. SRAM doesn’t test the tires on their wheels. And I don’t know what testing the tire companies do either. My guess is that it varies. Also, ETRTO has recently recommended 29mm tire widths as a minimum on 25mm internal width wheels whereas they were at 28mm before. Of course, the 454 are 23mm internal and the ETRTO is always super conservative but it’s interesting to see they are recommending wider rather than narrower tires now.

      With that out of the way, I really can’t advise you about risk. And I don’t know what may be causing your flutter. Perhaps tires; perhaps other things. All I can say is what we’ve tested. You’ll note that we originally tested 25mm Schwalbe Pro One TLE tires on those wheels without issue. The 28mm are more comfortable and may indeed have lower rolling resistance losses from vibration losses (rather than tire losses) than the 25mm ones and outweigh any aero gains from narrower tires. I can only speculate.

      I don’t think the issue is about blow-off. I’d wouldn’t expect there’d be a blow off issue with the 25s at the pressure you’re suggesting. The concern may be more about handling or specifically whether 25mm tire on a 23mm internal rim will handle well enough on high speed cornering. Again, my tester Miles didn’t have issues with that set up and he’s a P/1/2 racer. However he is also a great bike handler.

      The question I’d suggest you ask yourself is: What am I really trying to accomplish? If you’re competing in road races or crits, aero is going to be less important than handling and potentially a lot of other things unless you are are at a breakaway specialist or winning with a sprint at the line. If you are a TT/Tri rider, these aren’t the ideal wheels for that event and even if you use them there, getting the best aero body position will likely matter a whole lot more. If you aren’t racing at a high level or at all, kick back and ride the 28s. Heck, most in the TdF are riding 28s or wider now and they’re moving along pretty fast. Cheers, Steve

  • Martin A Navarre

    Hi Steve – thanks for the quick feedback and excellent points to contemplate. In parallel, I noted that Movistar uses these wheels and tires in 28mm, so yeah, that is interesting … I would like to know if they do that due to the SRAM approval list of if the Crr with 28mm tires outweighs the CdA of 25mm tires.
    I feel confident to try a 25mm tire on the front and see if this reduces the flutter. If yes, I would probably go with 25mm on the rear as well. It is likely this would help the wheels to be as aero optimized as possible according to the 105% ‘rule’. The Vittoria Corsa Speed tires are ridiculously smooth, it’s shocking how well they roll and manage road roughness. For handling, I actually prefer 25mm over 28mm … it’s hard to explain, but I prefer the lean over characteristics of the 25mm tire. Especially hard to explain becaue I used 2.4″ tires on my enduro MTB. But, I do not push the limits on the road in corners so it’s not really a benefit for me to use 50% of a 28mm traction vs. 60% of a 25mm traction. For a drop-bar bike, my position is as aero as my fitter and I can get without visiting a wind tunnel. I chose the 454 NSW’s for the balance of smoothness, speed and weight – I target 100km and up to 300km rides and events in the mountains and often riding solo. I will consider some kind of roll-out test with the 28mm tires before switching to 25mm. It would be nice to have some data and fun to try in any case.

    • Martin, your reference to the 105 rule and Crr vs CdA suggests you might benefit from reading this post: Steve

      • Hi Steve –

        Thanks and yes, I have read through your very thorough post regarding wider wheels and tires. It was a hard choice between Zipp 454NSW’s and ENVE SES 4.5’s. In the end, I knew I’d be OK with 25mm tires, so went for the Zipps.

        I did some roll out tests of my 2 different road bikes and my main takeaway is that this does indicate which bike is faster and rolls better. It’s not a test that produces great data, but my bike with the new Zipp wheels is ~1kph faster (at 50kph) than my bike with Mavic wheels, but there are many other differences between the bikes.

        I did not do a direct roll out comparison of 28mm vs 25mm tires on the Zipp wheels. I changed both tires from 28mm GP5000 S TR’s to 25mm Vittoria Corsa Speed and have gone on several rides. I can say clearly that the flutter with 28mm tires is absolutely gone with the 25mm tires. On different days, but wearing the same kit, the 25mm tires were 16s faster over a 7 minute descent (540m drop). (I was ~10s slower than my riding partner up the climb, but passed him on the DH!) I looked at ride data for several long straight section with speeds of 75-80kph and the 25mm tires were 1 – 3kph faster. I used 45psi in the 28mm tires and actually the same in the 25mm – front and rear. I would also say that the 25mm tires are smoother but that’s likely due to the construction.

        For me … I’m very happy with the 25mm Corsa Speeds on these wheels.

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