THE BEST CARBON DISC WHEELSET

If you own a road disc bike, you may be looking for that one all-around, carbon disc wheelset that performs well across a wide range of terrain. It’s a fair bit of work to sort through all of those out there now because, along with the rapid growth of road disc bikes, there’s been a quick evolution of carbon wheels for those bikes.

The latest generation of all-around carbon road disc wheels are faster, more comfortable, and do more things well on a wider range of terrain than the best rim brake wheels and many of the earlier disc brake ones ever did.

In this post, I’ll take you through the rapid evolution of road disc wheelsets, give you my ratings and reviews of models from leading wheelset makers against the criteria that matter most when choosing one, and recommend the Best Performer wheelsets.

Related: The Best Aero Bike Wheels

Related: The Best Lightweight Wheels for Climbing 

Related: How To Choose The Right Wheels For You

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BEST PERFORMER – ZIPP 454 NSW

Zipp 454 NSW

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$4000/£3200/3800, 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.

It’s a stiff, deep (54.5 to 58.5mm), and light (1378 grams) wheelset. Those three attributes along with the 454 NSW’s quick engaging rear hub make it so responsive that it redefines the term “snappy” and make it an ideal breakaway partner from flats to all but the steepest of slopes.

Combine all of that with a very smooth rolling hubset, an almost silent and fast engaging freehub, and its varying depth rims, and you’ve got a unique riding and looking set of wheels.

It’s available using these links to Competitive CyclistMerlin stores I recommended and rate highly for their prices, customer satisfaction, and support.

Read my full review here.

BEST PERFORMER – ENVE SES 4.5

ENVE SES 4.5

The ENVE SES excels on nearly as many performance criteria as the Zipp 454 NSW but at US$2850/£3100 costs a good amount less, especially if you are paying in US Dollars.

It’s also a better bet if you also want one wheelset for both paved roads and those long flat and rolling dirt or gravel ones. It feels as fast or faster on flat, rolling, and descending terrain, as comfortable on the good roads, and more comfortable on rough roads and unpaved paths than any other carbon bike wheels I’ve evaluated.

You can order it using these links to recommended stores Competitive Cyclist, Merlin, and directly from ENVE.

Read my full review here.

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WHAT YOU NEED TO KNOW ABOUT CARBON DISC WHEELSETS

Click on any red statement below to go directly to that part of the post

Carbon disc wheelsets are now in their 4th generation

A handful of performance criteria matter most when choosing between different wheelsets

Compare wheelset performance ratings, prices, and specs

Why I may not have included wheelsets you’ve heard about in this review

 

CARBON DISC WHEELSET DEVELOPMENTS

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

While it’s still early in this latest generation and most carbon disc 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 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, many 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 road disc rims were designed using 25C tires and produce vertical tire sidewalls that are narrower than the external rim width. Using 28mm tires on these wheels will reduce the aero gains you pay for when buying mid-depth, 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 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 mentioned quite often in my description of developments and the benefits they bring.

Removable valve cores, easier to mount rims, and a whole lot more experience with tubeless tires while testing all these road 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 of the best ones.

WHAT MATTERS MOST

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 carbon disc brake all-arounds 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’re only able to 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 carbon wheels which unfortunately do not perform as well, check out my review of 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.


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ALL-AROUND CARBON DISC WHEELSET COMPARATIVE RATINGS

Carbon disc wheels comparative ratings

Go directly to reviews:

Bontrager RSL 51 TLR

Campagnolo Bora Ultra WTO 45 Disc Brake

Easton EC90 SL Disc

ENVE SES 4.5

HED Vanquish RC4 Pro

Reynolds Aero 46 DB

Zipp 454 NSW

REVIEWS AND RECOMMENDATIONS

Best Performer

ZIPP 454 NSW – FAST WHEELS ANYWHERE YOU RIDE

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$4000/£3200/3800, 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 (54.5 to 58.5mm), and light (1378 grams) wheelset. Those three attributes along with the 454 NSW’s quick 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 was having great legs every day I rode them.

Nate, our A group Bullet Train ride leader who rode the 454 NSW on a couple 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). 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 where that wheelset 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.

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 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

When you aren’t on a breakaway, going over rolling terrain, heading up climbs, or sprinting for the line, you are likely doing a lot of handling. 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 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 wheels are similarly compliant nowadays, some deeper wheels tend to give up comfort by using a narrower rim to keep weight down. You make no such trade-off with this wheelset.

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 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 is it an all-around wheelset? 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 Tubeless Disc-brake wheelset at stores I recommend using these links to Competitive Cyclist and Merlin, stores I recommend because they have the best prices, customer satisfaction records, and selection on enthusiast-level cycling gear.


Best Performer

ENVE SES 4.5 – STILL STANDS ABOVE

ENVE SES 4.5

The second-generation ENVE SES 4.5, born the SES 4.5 AR, continues to stand above all other all-around wheelsets in the performance carbon 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 good 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 day 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

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 6 years before could still be the Best Performer among its 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 an all-around wheelset, and great performance across all criteria is the mark of the best, 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, my fellow cycling enthusiasts. 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 still make road disc rims with a 21mm inside width.

On the outside, the 4.5 rim has 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 rim has 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 height 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 along with 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 some, profiles, though none are as wide internally as the 4.5.

ENVE’s measurements show the average 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 $4000 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. 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 one of 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 Utah 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, 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.

First, 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 will only be 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 handful of 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, 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 turned 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 and £300 to $2850/£3100 and is available using these links to recommended stores Competitive Cyclist, Merlin, and directly from ENVE. 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.


BONTRAGER AEOLUS RSL 51 TLR – THE DEFINITION OF AN ALL-AROUND ROAD DISC WHEELSET

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 into 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.

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 wheelset. You can train with it at speed on a variety of 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-arounds (23.2mm internal, 30.7mm external), as deep as most all-arounds 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 is not going to 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

The Aeolus RSL 51 on Nate’s Venge

But, for an all-around 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 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 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 wheelsets we’ve ridden. Using these links, you can order them direct from Bontrager or at Sigma Sports.


CAMPAGNOLO BORA ULTRA WTO 45 – MORE THAN SKIN DEEP

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 was 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 wheelset. It doesn’t hold that speed as easily as an aero wheelset or the fastest all-arounds 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.

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 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.

Our test period included several days when the wind was blowing 15mph/25kph. In those conditions, you have to 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 gets pushed as well. 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.

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 tubeless, road disc wheels 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 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/£2600/€3000 at Chain Reaction Cycles and Tredz (10% off w/code ITKTDZ10) or more 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 using these links to Competitive CyclistWiggleChain Reaction Cycles, and Merlin.

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 these links to Competitive CyclistChain Reaction Cycles, Wiggle, and Tredz (10% off w/code ITKTDZ10).


EASTON EC90 SL DISC SOLID AT A GOOD PRICE 

Easton’s EC90 SL wheelsets have been through several iterations over the years. The rims have gotten wider, the hubs have improved, and tubeless and disc brake models have been added to the clincher and rim brake ones.

I’ve ridden several of these models and, as with the current EC90 SL disc wheelset that is the subject of this review, usually come away with the same conclusion – this is a solid wheelset and better than the last version.

“Solid” modifies several of the performance characteristics of the EC90SL disc wheelset. Overall, I always felt solidly planted riding these wheels. No surprises or conditions I need to worry about or make up for.

Easton Vault hub

The latest Easton, centerlock Vault hubs roll smoothly and coast with a rich (versus tiny or variable) freehub sound. The rear is a solid-looking thing with a hub shell shaped like the bottom 2/3rds of a nose cone as it increases in diameter toward the far larger drive-side flange.

There are a lot of specs – weight, pawls, teeth, engagement angel, etc. – that go with the hub description but what matters most is the noticeably quick acceleration it all produces.

I mention the hubs early in this review as I found they are what gives the EC90 SL disc its personality and allows the rest of the wheelset performance to be… solid, if not particularly distinctive.

It’s not an overly stiff or plush wheelset yet neither is it noodly or harsh. Crosswinds and wind gusts don’t affect your ride or line a bit, better than most in the all-around category.

I rode the EC90 SLs with 25mm Zipp Tangente road tubeless tires that together handled well through all the cornering and maneuvering I threw at it. Continental Grand Prix 5000 TL tires wouldn’t fit on these rims, a problem I’ve had putting those tires on other wheelsets as well.

While there are a lot of enthusiasts using 28mm tires on road wheels these days to get better comfort and handling, I’d recommend against that with these wheels if speed is a priority for you. Even the narrowest 28mm tires I tested measured only slightly narrower than the 28mm EC90 SL rims when mounted and most are wider.

This will put a big dent into the wheelset’s aero performance that is at best on par with the average hoops in this review of mid-depth wheels. And as mentioned earlier, the handling with 25C tires inflated properly is very good.

At a market price of $2000 in the US from Planet Cyclery, the EC90 SL disc is one of the less expensive wheelsets in the all-around road disc category. Outside North America, it’s harder to find and more expensive than most.

While it clearly performs a step above wheels in the increasingly popular $1000-$1500 value carbon category, it might be time for some further updates to move it from solid to standout.


HED VANQUISH RC4 PRO – STIFF, VERSATILE YET NEEDING A BIT MORE CARE 

It would be an understatement to say HED Cycling took a while to offer an all-carbon clincher wheelset. One of the first to sell wheels using toroid-shaped, deep-section rims to gain an aero advantage over 10 years ago, the company had only used their patented design for tubular or carbon-alloy wheelsets.

That has now changed with the introduction of the disc-brake-only HED Vanquish carbon clincher wheelsets. By not making these in a rim brake version, HED effectively avoided the engineering challenges other carbon wheelset makers went through to prevent overheating, delamination, or blowouts from the heat created by rim braking.

My fellow tester Miles, a successful P/1/2 racer who wins a lot, and I, a B-group rider who watches a lot of races on TV, evaluated the HED Vanquish 4, the 40mm deep all-around and shallowest of the new line which also includes 60 and 80mm deep models

HED Vanquish 4 Disc Wheelset RearThere’s a lot to like about the Vanquish 4. This is a highly competitive road disc wheelset for the company’s first all-carbon clincher offering.

At the same time, there are a few things still lacking and that might not appeal to the less competitive, less handy rider that makes me think HED would have benefitted from getting carbon clincher experience a bit sooner.

Above all, the Vanquish 4 is a supremely stiff wheelset. This provides a big advantage when initiating or responding to acceleration on the flats, charging uphill, and sprinting out of corners.

Miles felt a ton of confidence going hard into corners and the post-corner sprint stiffness was inspiring. In a full-out straightaway sprint, he found nothing lost in his forward progress toward the line.

The Vanquish 4 are relatively light wheels too. The pair we tested weighed 1466 grams without tape or valve stems, about 50 grams less than what HED claims. That made them one of the lightest and another one of the stiffest wheelsets in this category.

While you probably want rims deeper than these 40.3mm ones for maximum aero performance or a flat criterium, a race whose last kilometer has a 3-6% kicker into the finish would be ideal for these HEDs.

If like me, you aren’t a racer, all that good stiffness and handling and climbing are still the things you want and that I enjoyed in this wheelset. And if you branch out to do some mixed surface, gravel or cyclocross riding, the Vanquish 4 offers a lot of versatility as you can run 25C, 28C or wider tires with good sidewall support on these rims which measure 21.3mm internal width.

For best aero performance, you’ll want to run 25C tires. HED’s aero tests with the benchmark Conti GP4K SII show the 25C performs better than the 28C version of the same model tire. My measurements show the Conti GP5K TL measures 27.0mm at 80psi or a millimeter narrower than the actual 28.0mm external rim width at the tire/rim intersection and 29.0mm max. My benchmark 25C Zipp Tangente Speed Road Tubeless (RT25) comes in at 26.0mm at 80psi and the 28C at 29.0mm at 70psi.

Crosswinds within reason didn’t bother these HEDs even though they have more of a V-shaped spoke-edge rim profile than most of the U-shaped ones of current carbon hoops.

Miles and I had a slightly different impression of the Vanquish 4’s comfort. At 60-65psi with 25C tires, I found them to be in the middle of the range of the all-around carbon road disc wheels I’ve tested for this review. They didn’t seem a whole lot more comfortable at 50psi using 28C tires either. I found others including the ENVE 4.5 AR more comfortable.

Ever the hardman, Miles found them very comfortable at 70-75psi over rougher roads even though we weigh pretty much the same.

We did agree that the hubs rolled smoothly and the freehub audibly lets you know when it is coasting. It’s not anywhere near as loud as a Chris King, i9, or even Mavic hubs. While I prefer a quieter DT240 or silent Zipp Cognition hub, I didn’t mind the HED freewheel Sonic signature, a slightly higher pitched, higher quality sound.

Miles dug it.

Perhaps we’ve become spoiled with so many hubs not giving you pre-load adjustment options like these HED hubs do. The rear axle loosened and tripped up Miles when he swapped cassettes requiring readjustment to get it back into his frame. I had a similar issue with somehow changing the front preload and needing to readjust to get the rotor and caliper realigned. We’re both amateur wrenches and can deal with these things. I think this would frustrate most enthusiasts who may be a little less experienced.

We also agreed that the wheels’ tubeless setup wasn’t great. While both of us have a lot of experience with tubeless tires and rims, our experience with the Vanquish 4 suggests HED is behind the tubeless wheelset leaders.

First, HED doesn’t provide tubeless valves with these wheels. While that’s not unheard of, it is unusual these days and seems like a mistake considering you want to make things easy for your customers, especially considering all the variables in setting up tubeless wheels.

Second, for the wheels we tested, HED sent a rubberized sleeve or grommet that you put the valve into and then need to put in the rim’s valve hole. There’s very little tolerance for getting that sleeve in if you don’t cut out all the tape surrounding the valve hole.

If you wrap your rims twice with tape as I did with these wheels, there’s no chance of getting the grommet in unless you have a very sharp, small knife and remove all the tape covering the hole after the first pass and then again after the second. Using a valve I had in my workshop that already had a wide rubber bottom, I didn’t see the value of the grommet, couldn’t get it in deep enough for the tire bead to easily clear, and put them aside.

Why the need for the grommet? Well as Miles and I learned, without it, the valve will come through the rim bed if, or in our cases when, the tire pressure exceeds about 80psi for any length of time. It happened to Miles when he had his bike on the top of the car in the sunlight. My bike was inside the car on a hot day when the valve came through.

I went back, retaped with more attention to clearing the hole and getting the grommet in place. With that done, no problemo. Further, HED says they’ve changed the layup so that the grommet is not needed and no longer shipped with new Vanquish wheels.

The tubeless tires we used required a compressor for the tire beads to lockout in the bead channels. We also needed to put sealant in the tires for them to hold air for any length of time. For 28C tires, the one-shot canister Joe Blow type pump didn’t offer sustained enough pressure to lock out the beads.

Noting that Miles and I each had difficulty (and made a bit of a mess) trying 3 different tires, I’m led to believe that an easier mating bead hook would improve the tubeless setup experience. Or, you could turn this over to your local wrench to take care of it.

With the tubeless setup out of the way, the Vanquish 4’s performance will hopefully put it out of your mind. It’s available at HED dealers and online using this link to Competitive Cyclist, one of my top-ranked stores.

HED has recently renamed the wheelset the Vanquish RC4 to reinforce that it is a Road Carbon wheelset. They are also selling the one reviewed above as the Vanquish RC4 Pro and a model with a lower spec hubset called the Vanquish RC4 Performance that sells for $1,000 less. It’s also available at the store link just above.


REYNOLDS BLACKLABEL AERO 46 DB – FAST, STIFF WHEELS BEST FOR ROAD RACERS WHO WANT TO BE HEARD

If you are afraid of heights, people tell you “don’t look down”.

If being on trend is important to you, I’ll give you the same advice when it comes to the Reynolds Aero 46 DB carbon disc wheelset.

However, if road speed unperturbed by crosswinds is more important, just look forward, pedal and smile.

Reynolds has stuck with a classic, V-nose design for the spoke edge of these wheels and added a somewhat toroid-shaped rim profile heading to the other edge where the rim meets the tire for the 46, 65, and 80mm deep disc and rim brake wheels in its Aero line. This, when it seems like the world of carbon bike wheels have gone to blunt nose, U-shaped rim profiles.

For me, Reynolds’ design definitely works to produce and maintain my speed. While I did find myself looking down riding these wheels, it was to see my speed and power output rather than the rim profile. With the Aero 46 DB it felt like I was riding faster than normal in the same power ranges I normally ride.

My experience is, of course, anecdotal rather than scientific. Interestingly, I came across the wind tunnel chart below of tests done by DT Swiss.  It compares the aero drag of their ERC 1100 Dicut DB wheels, designed by the Formula One aero engineers of SwissSide they regularly tout, against Reynolds Aero 46 (blue line) and Zipp 303 Firecrest (grey line) wheelsets.

About 80% of our road riding is done when the wind is coming from a 0 to 10-degree angle (or “yaw”) and 50% is done between 0 and 5 degrees based on field testing done by Flo Cycling.Aero Drag chart comparing different carbon disc wheelsets

Unfortunately, DT Swiss didn’t specify whether the Reynolds or Zipp wheels are rim or disc brake or current or older models. It is kind of important as Reynolds only makes the Aero 46 in a disc brake version now and the current Aero 46 DB (introduced in 2017, the same year as the ERC 1100 Dicut DB wheels) are wider and likely more aero than the 2016 Aero 46 DB and rim brake versions.

Based on when the DT Swiss wheels were being designed and wind tunnel tested, my guess is that they are benchmarking the ERC 1100 against older models of the Reynolds and Firecrest rim brake wheels.

Regardless, it’s interesting to see the Reynolds Aero 46 held up as a benchmark in the same way the Firecrest has for years (but no longer should be as the NSW has surpassed it).

The second aero consideration is how well a deeper wheel does in managing side or crosswinds. Much of the reason for the move to the blunt nose design was to… uh… blunt those crosswinds and keep riders from having to steer against the wind and constantly modify their line or get blown off the road.

Reynolds Aero 46 DB carbon disc wheelset

The Aero 46 DB next to Zipp’s 303 NSW disc brake wheel

Well, that design clearly works. Wheels like the blunt nose Zipp NSWs in road disc and rim brake versions at various depths are better than the old Firecrest used to be.

But, my experience with the Aero 46 DB found them as good in crosswinds as the NSW despite a very different design. I rode 100 miles and 10,000 feet on the Reynolds wheelset in the Vermont mountains on a horrible rainy day with swirling winds coming at me from seemingly every direction and often when I was crawling up steep passes or “gaps” as they call them up there. Weighing a mere 150lbs/68kg, I notice crosswinds as much as anyone.

My mind and body were truly miserable in the rain and wind of this ride but the Aero 46 DB wheels were totally unphased by either.

That reminded me of what I often remind you: focus on performance rather than the specs or design hype (though Reynolds does hype their rim profile as crosswind beaters).

On to other performance considerations…

The stiffness and rolling smoothness of this wheelset is good though not without a few characteristics I don’t care for.

Both in and out of the saddle I find these Reynolds wheels plenty stiff. After many rides, the wheels remain true and I’ve found the spokes are all still tensioned. But when I crank out big watts (for me) going up steep hills, I occasionally hear the spokes ping.

I’ve flexed the spokes by hand and heard the pings but can’t tell whether they are coming from the ends of these straight-pull spokes in the flanges or rims, from rubbing against each other in the cross pattern, or from rubbing against the inside edge of the rim where the spoke passes through to reach the internal nipples. My guess is that it is the latter.

Whatever it is, it is a little disconcerting to hear these pings when you are cranking it out going uphill even though, as mentioned, the wheels ride stiff and have remained true.

They also ride very smoothly on the Torch hub internals supplied by Industry Nine. That said, much like the Chris King hubs, the i9s make a distinctive, loud freehub noise. Zing zing zing zing.

While I know it is popular with some, I personally don’t care for freehub zinging. You attract attention coasting down a road and you can annoy or even anger someone pulling their legs off in front of you to hear you freewheeling behind them. Sometimes it’s an invitation to pull enough to drop you and your coasting, wheel-sucking noise.

While my personal bias against occasional spoke and freehub noise doesn’t affect these otherwise stiff and smooth-rolling wheels, I found the compliance or comfort of the 46 Aero DB to be their weak link.

I ran this road disc wheelset tubeless with both 25C and 28C Zipp Tangente Speed RT and Schwalbe Pro One tires trying to find the best combination of comfort, speed, and handling. No matter, I couldn’t get beyond average compliance with any of these.

As the chart above and others like it show, wider tires increase aero drag. On the flip side, wider tires reduce rolling resistance, can improve handling, and allow you to ride at lower pressures to improve comfort.

So there are tradeoffs and you have to consider and tire choice decisions based on what you prioritize among those trade-offs.

For example, when you start riding at aero speeds (18-20 mph/29-32kph and up), the reduction in aero drag of a narrower tire far outweighs the increase in rolling resistance. Don’t ride that fast and care about comfort more than anything? Put on wider tires because your rolling resistance will be lower, comfort will be greater and you won’t be going fast enough to affect your aero performance.

Assuming, though, that you are looking to ride at aero speeds on these aptly named Reynolds Aero 46 DB wheelset (and the other wheelsets in this carbon disc wheelset category), know that only 25C tubeless tires measure narrower than the 28.2mm wide rims at the “brake track” that have a 28.6mm max width. The Zipp Tangente Speed tires measure 25.8 mm wide and Schwalbe Pro One measures 27.5 mm, both at 80 psi, the max pressure you’d want to run tubeless tires on 19C rims even if you weigh 200lbs/80kg. 28C tires measure wider than the outside width of the rims.

I didn’t measure them with tubed clincher tires. From my experience with other 19C rims, the benchmark 25C Continental Grand Prix 4000S II at 100psi measures very similarly to the Schwalbe Pro One at 80psi. Both measure wider than other popular tubeless and tubed clinchers.

With the 25C Zipp Tangente Speed road tubeless inflated to 65-70 psi where I run my tubeless tires on wheels with this one inside width, the Aero 46 DB wasn’t comfortable. Tolerable, yes. Comfortable no. If I were racing, I’d go with these tires both for their width on these wheels but also because they handle beautifully. You can read about other tire options in my review of tubeless tires

You can order these wheels through these links to Chain Reaction Cycles and Wiggle.

WHY I MAY NOT HAVE INCLUDED WHEELSETS YOU’VE HEARD ABOUT

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 available widely 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 Disc and SES 3.4 AR Disc, 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.

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Thanks and enjoy your rides safely! Cheers, Steve

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First published on September 23, 2018. Date of the most recent major update shown at the top of the post.

349 comments

  • 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 (https://intheknowcycling.com/best-road-bike-wheels/) 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?

    Thanks

    • 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.

        Thanks!

        • 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

    Thanks
    Iain

    • 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.

        Regards,

        Adrian

  • 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?

    Regards,
    Eric

    • 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

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