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Coefficient Road Race Carbon Handlebar
Coefficient Road Race Carbon Handlebar
Coefficient Road Race Carbon Handlebar
Coefficient Road Race Carbon Handlebar
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Coefficient Road Race Carbon Handlebar 1
Coefficient Road Race Carbon Handlebar 2
Coefficient Road Race Carbon Handlebar 3
Coefficient Road Race Carbon Handlebar 4

Coefficient Road Race Carbon Handlebar


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MSRP: $399.99
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Wow, What Are Those?!

The Coefficient RR (Road Race) carbon handlebar is purpose-built for riders that race frequently on pavement and/or gravel.

Both the RR and it's AR cousin feature Coefficient aero-ergonomics that make it easier to ride faster on the noon ride or an all-day ride. With a deeper drop and increased rigidity, the RR promotes a more aggressive, aerodynamic riding position. The patented Coefficient SWOPE (sloping, sweeping bar tops) carries over from the AR to relax your upper body and improve respiratory and neuromuscular function.

The RR Bar is Shimano Di2 compatible. It not only accepts the bar end junction, it includes exit holes for remote shifter buttons in four locations (2 each side) on the underside of the tops. It's also compatible with SRAM Blips.

When comparing handlebar weights keep in mind that the average off-the-front computer mount weighs in at 30 to 40 grams. The Coefficient RR is molded using Toray unidirectional carbon fiber and tested to the highest ISO international standards for professional road and mountain bike racing.

RR handlebars are UCI legal. Do note, though, the any use of the middle part of the handlebars as additional point of support will be considered as a violation of UCI Regulation 2.2.025: PART 2 - ROAD RACES (ctfassets.net)


  • Clamp 31.8mm
  • Drop: 127mm
  • Reach: 77mm
  • Flare: 5 degrees
  • Sweep: 12 degrees / Slope: 15 degrees
  • Weight: 310/315/320/325 g
  • Garmin computer mount included. Wahoo mounts sold separately.
  • RR bar Top Grips are also available
  • Not optimized for mechanical drivetrains

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.


Handlebar Clamp: 31.8 mm

Handlebar Shape: Aero 

Handlebar Style: Drop Bars 


Width: 36 cm


Width: 38 mm


Width: 40 cm


Width: 42 cm


Width: 44 cm


Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
Reviewed 4/2/2024
by Dan V
Cycling Enthusiast
Asheville, NC
Value Rating
Overall Rating
Comfort at a price

I bought these bars for my BMC Teammachine with the hope that they would be more comfortable on long days in the saddle. I bought them during a sale to help reduce the sting of the steep price. Even still, I wasn't sure they would be worth the price of admission. After a few solo climby rides in the mountains and a few longer group rides, I am happy with my purchase. These bars won't magically make everything better if your fit isn't already dialed in. If you're looking for better hand positions and less strain on the wrists/arms when in the tops, then they may be worth it.

I went from 40mm width bars to these in a 38mm width as my shoulders are somewhat narrow. The narrower width is comfortable for me and makes me feel ever so slightly faster - though I'm actually not. The built-in Garmin mount is great for my Edge 840 and the GoPro mount underneath is great for a front light.

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Reviewed 4/8/2024
by JH
Cycling Enthusiast
San Luis Obispo
Value Rating
Overall Rating
Innovative design, aero and comfortable

Thoughtfully designed handlebars, the swept back design is comfortable and aero (at least for me), drops are shallow with thumb rests. Works well with blip shifters on the tops. Very pricey, but BTD has them on sale periodically

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Reviewed 8/3/2023
by Joel_CA
Cycling Enthusiast
Value Rating
Overall Rating
5 of 5 customers found this review helpful.
Worth the price of admission

I've had the Coefficient RR handlebar on my 22 Specialized Roubaix Comp since March of 2023 and it has been a game changer. I find myself using the tops of the bar more regularly - which I avoided 100% of the time with the original handlebar. With that, I am able to use all 3 hand positions and am no longer experiencing any hand numbness etc. The comfort it provides long term is well worth the cost - plus... it looks REALLY cool!

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Reviewed 2/27/2024
by Anonymous
Daily Commuter
Lancaster, CA, USA
Value Rating
Overall Rating
I love them they are great

Awesome comfortable bars

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Reviewed 1/11/2024
by kevo
Cycling Enthusiast
Value Rating
Overall Rating
The Best Bars out there!

Awesome bars! Bar None, the most comfortable bars out there very lite weight and great for any riding, road or gravel .

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Reviewed 5/10/2024
by Viking Cyclist
Cycling Enthusiast
Chicago, IL
Overall Rating
Good upgrade, but expensive.

I use it on a gravel bike that doubles as a road bike. The SWOPE tops are the biggest improvements over a traditional/aero drop bar. I find myself on the tops a lot more due to the comfort. The notch for the thumbs in the drops are a neat feature too. Elsewhere on the bar are similar to a traditional bar in terms of shape and comfort in my opinion. Expensive, but there are some comfort gains. Installation requires longer brake hoses due to the additional extension/bends, but fairly straight forward.

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Reviewed 8/18/2023
by Ron In CO
Cycling Enthusiast
Steamboat Springs, CO
Overall Rating
10 of 10 customers found this review helpful.
A Revolution in Handlebar Design

To test the bars, I did a 45 mile gravel ride with 3K of climbing. I was surprised and amazed how comfortable the bars are. I had a marked reduction in shoulder pain (bone on bone sucks). The back sweep works magically. I rode much more on the tops utilizing the thumb grooves on flats with bent arms in an aero position. I was able to hold this position longer. For climbing, the hands on the tops position was fantastically comfortable and provided a leverage point to pull on. The extreme bend where the hoods and tops meet create a great perch for hands, its a larger than the area on traditional bars. Lastly, the slight flare was perfectly aligned when dropping hands down from the hoods to the drops. I can't speak empirically to the aero benefits but there are plenty of studies that prove the aero design of these bars will save you a few watts. I can say the bars look very cool though!

Common questions answered here! unless your old bars reach and drop are significantly different, No, you don't need to adjust your stem, No, you don't need to adjust your stack height. You may need to tweak the grip position on the bar slightly since the bar has a slight forward tilt. But otherwise, measure the reach on your old handlebar setup; front of the saddle to a point on the shifter grips and also the previous handlebar tilt (digital level is best). The integrated GPS holder is brilliant but with the bars almost level, your GPS will slightly tilt forward (away from you) but using a Garmin 1040, I had no issues reading the screen.

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Mechanic's Corner

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An introduction to selecting the proper road bike handlebars.
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