The Shimano Dura-Ace BR-R9110-R is a direct mount rear brake caliper engineered for modern aero road frames that position the rear brake under the bottom bracket. Part of the Dura-Ace R9100 groupset, it delivers class-leading braking performance with refined modulation — ideal for road racers and triathletes chasing every aerodynamic and performance advantage.

Highlights

• SLR-EV dual symmetric pivot: Twin bearings and a precision roller reduce friction and flex by 43% over the previous Dura-Ace generation, delivering more stopping power with less hand effort.
• Direct mount under BB design: Low-profile caliper mounts directly to the chainstay beneath the bottom bracket for seamless integration with aero frame designs and improved airflow.
• 28mm tyre clearance: Accommodates tyres up to 28mm and rims with external widths from 20.8–28mm, offering real-world versatility for varying road conditions.
• R55C4 brake pads included: Shimano's premium aluminium-rim brake pad delivers consistent, progressive stopping power in wet and dry conditions.
• Adjustable magnesium pad holder: Pivoting, angling shoe cartridges allow precise pad alignment for optimal contact and even pad wear.
• Lightweight aluminium construction: Anodised aluminium body with titanium pivots and hardware keeps weight to just 139g.
• Near-black finish: Subtle near-black fade with high-polish accents complements any Dura-Ace R9100 build.

Performance & Technology

Shimano's SLR-EV (Super Light Response – Enhanced Value) system brings together a dual symmetric pivot architecture with twin bearings at each pivot point and a smooth-running roller. The result is a caliper that responds instantly to cable input and maintains consistent pad pressure across the full braking arc — giving riders the precise, fade-free modulation required in criteriums, technical descents, and fast-moving bunch rides.

Compatibility & Fit

The BR-R9110-R is designed for frames with a direct mount under-bottom-bracket rear brake position. It is compatible with Shimano 11-speed STI levers including ST-R9100 and ST-R9150 (Di2), and maintains the same cable pull ratio as the previous Dura-Ace 9000 and Ultegra 6800/5800 generations, allowing use with those levers as well. Reach: 51mm. Compatible rim width: 20.8–28mm. Maximum tyre size: 28mm. Includes R55C4 brake pads for aluminium rims.