THE BEST DISC BRAKE COMPONENTS FOR ROAD BIKES
After writing earlier about why and when to buy a road bike with disc brakes, in this post I review and recommend disc brake components.
In my post Why and When to Buy a Road Disc Bike, I described the braking, speed and versatility benefits that convinced me to recommend that road cycling enthusiasts get or build a bike with disc brake components and wheels when they buy their next bike. I also laid out when would be the right time to make that purchase over the next few years depending on whether you are an enthusiast primarily focused on racing and competing or endurance riding and events or general fitness.
In this piece, updated in early 2016 to account for newly introduced models, I’ll give you my design, product and performance evaluations and my purchase recommendations for disc brake components. In two more posts, I’ve provided similar types of reviews of road disc bikes and wheelsets.
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When talking about disc brakes, there are several components to consider. There are the brake calipers, pads and rotors that the calipers squeeze to create the friction for braking. There are also the integrated shift and brake levers that control the braking action, and the tubes and hydraulic fluid that run between the levers and brakes. All of these together make up a disc ‘brakeset’.
I know, brakeset is industry jargon like ‘wheelset’ and ‘groupset’ but it’s a helpful shorthand to cover the different items that go into braking without listing each of them individually over and over again.
The arrival of road disc bikes for the enthusiast level rider comes in large part due to the introduction between 2012 and 2014 of integrated electronic or mechanical shifting and road disc brake levers from Formula, SRAM and Shimano that use hydraulic fluid rather than cables to control the brakes. In these systems, you move your brake lever and the push from hydraulic fluid pressure, rather than the pull of a cable, closes the brake caliper over a rotor mounted to your wheel. I’ll call this a ‘hydraulic-disc’ brakeset.
There are two alternatives to hydraulic-disc brakesets. A ‘cable-disc’ brakeset has brake levers that connect to and actuate disc brakes using traditional brake cables. You’ll see a fair number of cable-disc brakesets on lower cost bikes. With a ‘hydraulic-rim’ brakeset, your brake levers control hydraulic fluid that runs to calipers closing on your wheel rims rather than on rotors.
As an aside, note that some use the term ‘mechanical-disc’ brakeset for what I call cable-disc brakesets . They are the same thing. I find the term mechanical-disc confusing as there are also mechanical (and electronic) shifters with integrated brake levers. Some of the mechanical shift/brake levers connect and actuate the brakes using hydraulic lines and some use cables.
Both the cable-disc and hydraulic-rim these alternatives provide less performance benefit than you get from a hydraulic-disc brakeset. The cable-disc gives you less power and control and the hydraulic-rim has similar wet weather and downhill braking performance as regular rim brakes. I recommend against both of them if you are planning to buy a new road disc bike.
Before hydraulic brake levers came along, you could only get cable-disc brakesets supplied by companies including Shimano, Avid (owned by SRAM), TRP and Hayes for road or cyclocross bikes. You will see 2016 model year cable actuated disc brakes, mostly on sub $2500/£1500/€2250, aluminum road and off-road bikes with tier 3 and lower level groupsets like the Shimano 105, Sora and Tiagra models.
Campagnolo has not introduced a disc brake system or announced their plans beyond their CEO commenting they would not launch anything until 2016 to be in sync with the pro race circuit adoption path rather than the enthusiast consumer road cyclist one. As of early 2016, there is still no official news a Campy’s hydraulic disc brake program or offering. A few of the companies or bike builders will special order/configure a Campy top end mechanical or EPS groupset with a cable-disc caliper and rotor from TRP, but I don’t really see the point of that unless you are unwilling to ride anything but Campy and want road disc.
I haven’t found either hydraulic-rim or cable-disc brakesets on new 2016 model year standard equipment carbon road bikes, the favored frame material and price point at and above which you’ll find most road cycling enthusiasts’ bikes. Since my focus is on the road cycling enthusiast riders, I’ve only evaluated and will only refer to hydraulic-disc brakesets and road disc bikes using this kind of brakeset in the remainder of this post.
Hydraulic levers offer the benefit of better control and feel, or what’s called ‘modulation’. They use the superior power and friction-free, progressive flow of the hydraulic fluid to reduce the amount of effort required from your hands to brake so you get more ‘touch’ or ‘feel’ in your braking. With the touch of a finger or two on your hydraulic brake levers, you can consistently brake hard and late going into corners with confidence, readily use your brakes down long descents without fear of your rims overheating (since disc brakes don’t touch the rims), and you won’t feel your brakes get spongy or fade if you are braking for a long time. And you can do this in dry or wet conditions with equivalent brake response.
While integrated shifters and brake levers are standard on rim brake bikes, designing them with space for the hydraulic brake cylinder and reservoir was quite a neat bit of engineering. SRAM didn’t get it quite right on their first go in 2013. They recalled their hydraulic shifters later that year and re-designed and replaced them in the second half of 2014. Shimano have had better success, launching integrated shift and brake levers without incident for their Di2 electronic groupsets in 2013 and for their mechanical shifting sets in 2014, each for the next model year.
For their first road brake calipers and rotors, Shimano essentially rebadged products with technology they’ve used successfully for a number of years on their mountain bikes. They’ve since developed ‘flat-mount’ calipers for road bikes that mount on the rear chainstay for a clean look and more aero fit. SRAM developed road bike specific disc calipers and rotors based on the experience if not the same designs used in their Avid mountain bike components business.
The design challenge for road bike calipers, pads and rotors is to find ways to cool the heat created during braking. Shimano, for example, use 140mm rotors made of aluminum bonded between surface layers of stainless steel to draw the heat away from the braking surface. They have also designed-in cooling fins along the inside edge of the rotor’s braking surface and atop its calipers for the heat to exit as shown in this photo.
SRAM favors the use of larger area 160mm, all steel rotors rather than fins to disperse the heat.
The respected German cycling magazine Tour Int. did rotor testing and established some conservative guidelines I’ve listed here for Shimano rotors based on rider and bike weight.
140 mm Shimano Ice Tech rotors:
- Flat terrain
- Cyclo-cross with little elevation gain
- Hilly terrain with gradients less than 10% and total weight (bike and rider) up to 85kg/187lbs
160 mm Shimano Ice Tech rotors:
- Flat to hilly terrain with total weight (bike and rider) up to 100kg/220lbs
- Alpine terrain with long descents of less than 15% and a total weight up to 85kg/187lbs
160 mm all steel rotors:
- Flat to hilly terrain with total weight (bike and rider) up to 120kg/265lbs
- Long and steep descents over 15% and a total weight up to 100kg/220lbs
The leading bike brands have basically ignored these guidelines, instead putting their trust in Shimano’s testing and conclusion that 140mm rotors work for all but the heaviest riders. In most cases, frame and wheel set-ups and clearances allow you to make your own rotor size choice.
Since most of your braking should be done on your front wheel, another option for riders is to go with a 160mm front rotor with a 140mm rear rotor. I’ve seen this set up on several 2016 model year disc brake bikes that have Shimano disc brakesets and this is a good option for heavier riders.
Why not just go conservative with 160mm rotors and be done with it? For some, the weight or looks of the larger rotor is a turn-off. Others feel that specifying more than is needed gives you more braking power than you really want. (My lawyer friends have told me not to recommend one size or the other.) Shimano and SRAM each make both rotor sizes so you can also make your own choice.
A lot of work is also going into reducing the weight added by going to disc brakes. Shimano’s RS785 electronic shifting brakeset and RS685 mechanical shifting brakeset each weigh about 350 grams (353g and 358g respectively, to be exact) over the rim braking Ultegra 6870 Di2 and 6800 mechanical groupset components they replace (hydraulic shifter/brake levers, disc calipers and rotors for electronic or mechanical shifter/brake levers and rim calipers).
The rest of the roughly 450g or so of average current weight penalty for going disc comes from the frame and forks (typically about 50-75g) and slightly wider and beefier wheelset hub and extra front wheel spokes (also about 50-100g).
I addressed the weight concern in a post about why and when to get a road disc bike. In summary, unless you are a very fit racer, a pound or two of non-rotating mass or weight will not make a discernible difference to the performance of your bike or speed of your ride. If you think it does, take only one water bottle on your next ride and let me know if you can tell the difference. Or if you only take one normally, take an extra one with you next time out and see if you notice any change in speed or handling or anything else.
Beyond weight, there are three other concerns some mention when considering getting a bike with disc brakes: 1) they are noisy, 2) they are more complex and need more maintenance than rim brakes and, 3) they are less aerodynamic. I don’t think any of these are issues but let me take them one at a time.
Noise – Disc brakes should only be noisy during a brief period when you ‘bed-in’ or smooth out the surface of the rotors and pads. Bedding in can be done simply by pedaling up to your normal speed and then using the brakes to gently and gradually slow your bike until you are riding just a couple of miles per hour. Repeat the process about 20 times and your brakes will be ready to ride full on without any noise. Don’t brake hard or come to a complete stop. Bedding in is a noisy process and not my idea of a good time, but once done your brakes will be quiet. Perhaps you can do it at an empty school parking lot on a weekend morning or mid-week evening.
This is essentially what you need to know to properly break in (pun intended) and silence your disc brakes but if you want to read more about this and the choice between organic and metallic pads, check out this good article from Art’s Cyclery.
Maintenance – When it really comes down to it, disc brakes should be easier to maintain than rim brakes. If your rim brake ‘maintenance’ amounts to changing out a front pad every now and then, what I just wrote is wrong but then again, you probably aren’t real safe on your bike.
If you really do maintain your rim brakes, you should be doing the following:
- keep the brake cables clean to minimize the extra friction from road dirt that collects on them.
- check the cable ends to make sure they aren’t fraying and replace them when they are or when the cables are corroding,
- keep the calipers centered and the pads braking on the middle of the rims especially after you take off and put on a wheel,
- wind the barrel adjusters or reset the cable lengths periodically to keep the caliper openings and brake lever pull or stroke distance and tension consistent as the pads wear,
- keep the calipers, adjusters and springs clean and lubricated,
- toe in the brake pads if necessary to reduce or eliminate noise,
- and yes, replace the brake pads when needed
With hydraulic-disc brakes, the biggest and really only maintenance job needed is to fill the brake lines with specified mineral (Shimano) or DOT (SRAM) oil and bleed them of any air. If you have a mountain bike, you may be familiar with this well established process. If not, here’s a thorough video that lays it out.
Basically you fill the system from the rear caliper and bleed it from one of the brake levers through fittings built into those components. It’s rather simple to do and there’s a kit which has all you need but you should be disciplined about it to do it right.
While the videos show that both replacing cables and bleeding your brakes are quite doable, many of us enthusiasts will take our bikes to the shop to take care of these jobs.
Once you have filled and bled your brakes, typically as part of a winter or spring tune-up, and you’ve properly bedded in any new pads you’ve put on the bike, there’s minimal if any adjusting you’ll have to do to the brakes during the season. Thanks to the pressure of the fluid, hydraulic brakes self-adjust their caliper center position and opening gap as well as the brake lever stroke so there’s no need to regularly check and tune those.
You’ll want to keep your disc pads clean of dirt and oil and replace them when necessary, the later being just as easy if not easier than with rim brake pads. Here’s the link to a good BikeRadar article with some tips on road disc brakes if you are home wrench and some tips from Art’s if you want to see how the pros service disc brakes.
As with anything else on your bike, if you crash or mishandle it in transport, you may need some service. Most common in these situations is a brake rotor that gets a little bent. You also may want to run some 120 grit sandpaper over your pads or rotors to remove some glaze to extend the pad life a little.
While Shimano has their Dura Ace, Ultegra, 105 and other groupsets for rim brake bikes with complete sets of components including shifters, brakes, chainsets, derailleurs, etc. at each level, they haven’t given family names to their disc brakeset components yet. Still, it is possible to make some sense out of their RS nomeclature and align them with groupset levels. Here’s my best take at what they offer with explanation to follow.
Shimano makes the RS785 hydraulic-disc brakeset designed to work with their Dura Ace 9070 Di2 and Ultegra 6870 Di2 electronic groupsets. This usually come as a kit in combination with the ST-R785 shifter/brake levers with the top or Dura Ace level BR-RS785 disc brakes. You may also see the Ultegra level BR-RS685 brakes grouped on new bikes equipped with the ST-RS685 brakes on bikes which otherwise have Ultegra derailleurs and other Ultegra family components.
For their mechanical groupsets, they make the ST-RS685 shifters to go either with with their Dura-Ace 9000 or Ultegra 6800 mechanical derailleurs. These come in kits and on new bikes typically with BR-RS685 brakes but I’ve seen BR-RS785 brakes with them as well on some of the 2016 bikes.
For 2016, Shimano introduced “flat mount” brakes which mount flush on the front fork and rear chainstay rather than through raised bumps or ‘posts’ on the chain or seat stay as shown in the photos above. Posts are also used on the front forks to mount the brakes. The BR-RS785 and BR-RS685 are “post mount.” The post mount brakes are carryovers from the mountain brake line. The flat mount brakes are designed for road bikes and tuck the brakes in to provide a cleaner look and, in theory, a more aero set-up. I haven’t seen any testing to confirm the aero claims.
The biggest benefit of flat mount brakes, frankly, is the space it saves on the frame and the ease of which you can access the calipers. So chapeau to the Shimano for coming up with this standard and making the life of shop and home wrenches a bit easier.
Your frame must be designed for flat mount brakes to use them and only the newest frames are. You can mount post mount calipers on flat mount frames with an adapter but you can’t do the reverse.
At the same time as Shimano introduced the flat mount brakes, they extended the hydraulic-disc line to the third tier 105 groupset. This line only has a mechanical shifting option and they use the ST-RS505 shifter/brake lever at this level and usually pair it with the BR-RS505 brakes. Shimano also introduced the BR-RS805 flat mount brakes, an Ultegra level brake that is showing up on 2016 bikes that designed for flat mounts brakes that also have Dura Ace or Ultegra electronic or mechanical groupsets.
Hope this explanation and the chart makes all of this a bit easier to decode. If you are building up your own frame, I have links at the end of this post to where you can get all of these components at the best prices I’ve been able to find from stores with excellent customer satisfaction ratings.
For all of these, the the Shimano Ice Tech Freeza rotors are sold separately.
SRAM is a lot easier to explain. They sell Red 22, Force 22 and Rival 22 HydroR hydraulic-disc brakesets. These are slightly different kits for each groupset level. As with the Shimano groupset components at different levels, weight and materials are the primary differences between the SRAM components, consistent with how they design their other groupset components. As with Shimano, the rotors are sold separately.
SRAM is adopting the flat mount standard. A nice photo here shows the post mount (top row) and flat mount calipers here.
SRAM has yet to introduce an electronic shifting groupset for its hydraulic brakes. With their eTap electronic groupset just coming out for their Red 22 rim brake groupset in 2016, I wouldn’t expect an electronic shifting, hydraulic braking groupset from SRAM any sooner than 2017 if then. I base this guesstimate on the priority and engineering resources SRAM is likely to have spent since 2014 on the electronic groupset, the time required for development and testing of an electronic HydroR brakeset, and the very deliberate approach SRAM will likely take to a new hydraulic brake lever after the problems that forced it to recall its first one.
While Campagnolo has its EPS electronic shifting groupsets, it has not developed a hydraulic brake system as yet. You can configure a few road disc bikes with a Campagnolo groupset and cable actuated disc brakes supplied by TRP, though I think that is sub-optimal for the reasons I described earlier about cable-disc brakesets.
As you can see, each of the companies is taking a very different approach. Shimano entered with an electronic shifting hydraulic-disc brakeset and moved within a year to add a mechanical shifting hydraulic-disc brakeset and then a third tier mechanical shift/brake levers and flat mount calipers for all tiers. None of these are badged as Dura Ace, Ultegra or 105 groupset series.
I’d expect we’ll see series-specific brakesets in the next year or two, differentiated only by their materials and weight rather than their function and performance. Worth waiting for? I don’t think so. The difference between SRAM’s top-tier Red 22 and third tier Rival 22 hydraulic-disc brakesets is only 44 grams.
Meanwhile, Shimano have moved quickly and successfully to be the hydraulic-disc brakeset specified on most new road disc bikes.
SRAM, also have the new road disc bike market in their sites with their ‘hydraulic-disc’ option integrated into their Red, Force and Rival levels. They’ve never been able to capture more than a small portion of the OEM groupset market against Shimano though they are the only true competition to Shimano as Campagnolo appear to have all but abandoned this channel to focus on selling their groupset components in the after-the-bike-sale or ‘after market’.
With their ‘hydraulic-rim’ option, SRAM also appear to be targeting current road rim brake bike owners who want to switch to hydraulic brakes, but do it on their current frames, thereby sparing the cost of buying a new bike and wheelset. That’s a smart strategy for those of us who aren’t ready just yet – either because our current bikes and wheelsets are in good shape or our bike gear budget isn’t – to add a new frame, groupset and wheelset but still want some of the benefits of going to road discs.
The Italian brake and components company Formula were the first to design hydraulic brake levers integrated with Di2 shifters. They didn’t work well when initially introduced and I haven’t seen any recent reports or reviews on them. Formula brakesets aren’t equipped on any new enthusiast level bikes this season offered by the 18 reasonably well-distributed bike brands I’ve identified.
Campagnolo, with less groupset sales and likely a smaller engineering team than either Shimano or SRAM, have probably not been able to marshal their resources to develop a hydraulic solution. They spent a good part of 2014 designing a complete new mechanical groupset line up for model year 2015. They were rumors that they were working with Formula to come up with a disc brake solution but there has been nothing out of Campy on this.
Even if they had the resources, Campagnolo’s strategy to command high prices on premium products has been based on road cycling enthusiasts following the lead of the elite professional riders. As mentioned earlier, the pros are way behind on road disc bikes, likely not to begin thoroughly testing them in races until 2016 and perhaps then, even sparingly.
Fortunately, for those who want to go with electronic shifting on a disc bike, the Shimano RS785 hydraulic-disc brakeset coupled with the Dura-Ace or Ultegra Di2 system was well received and is available on a good range of 2015 model year bikes. The integrated electronic shifter and hydraulic brake lever (ST-R785) has the same ergonomics as the standard Di2 integrated shift lever; it feels nearly identical when you put your hands in the hoods. Some have made mention of the slightly taller hydraulic Di2 shifter hood body but this is an aesthetic difference only.
The same goes for the mechanical shifting, hydraulic braking Shimano lever (ST-RS685) and its cable braking sibling. The width and ergonomics are the same but somehow they’ve managed to design space for the hydraulic fittings into the body along with the mechanical shifters. The hydraulic braking lever extends a little longer than the standard cable brake one, perhaps helping to making room for the hydraulics in the hood body without having to make it any taller.
Here are some comparative photos.
Rolling back the shifter cover, you can easily use a screwdriver to adjust how far out your levers sit from the handlebar (up to 10mm of ‘reach’) to accommodate the size of your hand and how soon the braking kicks in once you start pulling on the levers (the ‘stroke’). You do this on initial set-up and you are done; you don’t need to adjust as your brake pads wear.
When it introduced its mechanical shifting hydraulic disc brake lever, Shimano also updated its brake caliper slightly. The new BR-RS785 and BR-RS685 calipers (vs. the old BR-R785 without the S) makes the hose routing a little easier for road bikes. The hose now comes into the top or inside of the caliper; before it came into the side or outside of the caliper. This makes installation and filling a touch easier but doesn’t change the performance.
On the road, the Shimano brakesets deliver on the promise of disc brakes. Both the Di2 and mechanical shifting are unaffected by the presence of the hydraulics and they shift and brake equally well whether your hands are in the hoods or drops. You can deliver braking power with less effort and more feedback.
Even going down a steep hill, you brake easily with a finger or two on the hydraulic brake lever to get just the right amount of deceleration you want rather than wrapping your hand, from fingers to palm, around the mechanical brake lever and hoods or drops, forcefully grabbing the brake while hoping you don’t lock up or skid out.
You get the kind of feel, more finely controlled braking and consistency of braking regardless of the road surface with hydraulic disc brakes that you just can’t get with mechanical rim brakes. Rather than overwhelming your brakes and bike, the additional power available in Shimano’s hydraulic-disc brakesets are tuned to allow you to use less of your own, getting the same amount of force to the brakes, but in a much more finely controlled way.
After a short time riding with hydraulic-disc brakes, the naysayers and believers alike say something like “I never imagined how good it could feel to brake.”
The redesigned SRAM HydroR integrated hydraulic braking groupsets successfully completed their first competitive campaign on the US cyclocross circuit during the 2014/2015 winter season. With apologies to Richard III, this “made glorious” the prior “winter of our discontent” surrounding the recall of the company’s original integrated shifter and brake lever design.
The response and transparency which marked the recall of the initial SRAM hydraulic system and the design changes made both to address the hydraulic cylinder problems and improve the ergonomics were significant, detailed and a great example of everything you would want as a consumer. (See here for more)
In terms of what you can see and feel now, the functional improvements (beyond the fitting changes) are a reduction in the stroke or distance you need to move the brake lever to get it to engage (eliminating “dead travel”), a smaller shifter panel providing more room for your fingers when in the drops and while wearing gloves, and a new spring in the disc caliper to get the pads opening more quickly.
Aesthetically, the SRAM HydroR hoods are tall, markedly taller than either of the cable actuated SRAM hoods or the Shimano hydraulic ones. The 160mm rotor also looks big compared to the 140mm ones. I’m typically less focused on the look of a bike than on its performance, but for those of you who rate looks high on your list, you’ll notice the SRAM hoods and rotors more than you will the Shimano ones.
I’ve previously recommended going with an electronic groupset over a mechanical one if you can afford it and specifically with the Ultegra 6870 Di2 over the Dura-Ace Di2 or EPS gruppos from Campagnolo. As I said in my groupset review, the recommended Ultegra Di2 “performs better than mechanical ones, is more enjoyable to ride, and requires less service. It will enable you to go faster than you would with the best mechanical groupset.” I describe why this is the case in more detail later in the same review.
As for mechanical groupsets, I recommended the Ultegra 6800 over others from Shimano, Campagnolo and SRAM as the best value, considering both the performance and cost criteria that I detail in the review.
For much the same reasons, and adding the fact that the SRAM brakesets are twice the price of the Shimano ones now for no good reason that I can determine, I’d recommend the Shimano RS785 and RS685 brakesets with Ultegra 6870 Di2 and Ultegra 6800 groupsets and the flat mount BR-RS805 brakeset if your new road disc bike is set up for it. I wouldn’t change my choice of bike or frame just to get a post mount one if you prefer everything else about one that doesn’t have that design feature. I would generally stay clear of bikes with the 105 hydraulic groupset (RS505), not because of the of the shifter/brake levers and calipers per se, but because the other components in the 105 set and on the bike it normally comes on at that level isn’t on par with those of the Ultegra or Dura Ace component equipped bikes.
You can also use the RS785 brakesets with the Dura-Ace 9070 Di2 and the RS685 with the Dura-Ace 9000 groupsets. I don’t think, however, that the road cycling enthusiast gets any benefit spending the extra money for the indiscernible weight savings going to a Dura-Ace or SRAM hydraulic-disc groupset.
And while you can go hydraulic and save a boatload of money by putting a SRAM hydraulic-rim brakeset on your current road bike instead of buying a new disc frame and disc wheels, I don’t think the incremental modulation benefits are worth the cost of buying this set-up. You’ll still have limitations on wet roads and in the mountains with your hydraulic-rim braking system on carbon wheels.
All of that said, I know that some people prefer the shifting mechanisms of SRAM or Campy or Shimano over the other two for perfectly good personal reasons. While I think they are all sound and easy to adopt coming from one to the other, I won’t deny that personal preferences and aesthetics or weight may be more important to some than performance and cost.
Here are the page links for these components at the stores I’ve found have them at the best prices, have them in stock and have top shelf customer satisfaction records as of June 21, 2017:
Shimano Ultegra 6870 Di2 Disc Brake Groupset
Shimano Ultegra 6800 Disc Brake Groupset
Shimano 105 5800 Disc Brake Groupset
Shimano ST-R785 shifter/brake lever STI and caliper brake set for electronic Di2 shifting groupsets sold with BR-RS785 post mount or BR-RS805 flat mount brakes.
Competitive Cyclist, ProBikeKit UK code ITK10
Shimano ST-RS685 shifter/brake lever STI and caliper brake set for mechanical shifting groupsets sold with BR-RS785 or BR-RS685 post mount or BR-RS805 flat mount brakes.
Competitive Cyclist, Tweeks Cycles, Ribble (flat mount), Ribble (post mount)
Shimano ST-RS505 shifter/brake lever STI and caliper brake set for mechanical shifting groupsets sold with BR-RS785 and BR-RS685 post mount or BR-RS505 flat mount brakes.
Competitive Cyclist, Tredz, ProBikeKit UK code ITK10
SRAM hydraulic groupsets and components available at recommended stores below
Note that Shimano sells kits that include both left and right shifters and front and back calipers in the same package while SRAM sells them as a one shifter-caliper combination (e.g. left-rear or right-front). This means you have to buy two SRAM kits to fully equip your bike with shifters and brakes.
You may also see some stores selling entire SRAM groupsets with complete hydraulic brakes included as part of them. I haven’t included these above so as not to add further confusion but I can provide you links to stores offering this if you leave me a comment below.
Got it? Good. I admit it’s not simple to sort through.
For more on this topic, here are links to why and when to buy a road disc bike, some of the best 2016 endurance road bikes with disc brakes and road disc wheelsets.
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