Shimano
Ultegra RS811 Direct Chainstay Mount Brake Caliper
Best rear brake upgrade for serious road cyclists.
Engineered for reliable stopping power on the rear of your bicycle, the Shimano Ultegra RS811 R Direct Chainstay Mount Brake Caliper offers precise integration with compatible frames. As part of the respected Ultegra series, it delivers consistent performance for serious road cyclists. This caliper is specifically designed for rear wheel application, ensuring dependable braking control when you need it most on your rides. Experience the quality and performance that Shimano Ultegra is known for, enhancing your cycling safety and confidence with its direct chainstay mount design.
$104.99
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Owner Satisfaction
4.7
/ 5
Category Rank
68
/ 2100
#68 in Components
Price vs Category Average
+2%
Above average
Type
Rear Caliper
/ Rear Caliper
Who it's for
- Competitive cyclists seeking every aerodynamic advantage
- Performance riders demanding reliable, high-modulation stopping power
- Aggressive racers needing maximum braking efficiency and stiffness
Who should skip it
- Home mechanics who prefer easy access for routine maintenance
- Cyclists with standard frames lacking specific mounting points
- All-weather riders concerned about road debris and grime buildup
Performance breakdown
Stopping Power
Delivers confident, immediate deceleration even in demanding road conditions.
Modulation Precision
Offers a refined, predictable feel that makes speed control effortless.
Frame Integration
Direct mount design eliminates flex for a cleaner, more rigid interface.
Build Quality
Premium materials ensure long-term durability and consistent mechanical reliability.
Aerodynamic Profile
Low-profile shape minimizes drag compared to traditional seatstay-mounted calipers.
Maintenance Ease
Setup is straightforward, though chainstay positioning requires careful cable routing.
Key Specs
Type
Rear Caliper
Model Number
IBRRS811R82
Features
- Direct chainstay mount design
- Optimized for rear wheel braking
- Reliable stopping performance
- Part of the Ultegra component group
- Consistent performance for road cyclists
What customers say
Riders consistently praise the Shimano Ultegra RS811 Direct Chainstay Brake Caliper for its exceptional braking performance and reliability. Users highlight the impressive stopping power, noting it is firm yet easily modulated, offering a confident feel even at speed. The direct mount design is appreciated for its clean aesthetics, improved aerodynamics, and enhanced stiffness, leading to a more responsive braking experience. While positioned in the premium segment, the consensus is that the significant performance upgrade justifies the investment for serious cyclists. Minor considerations regarding adjustment accessibility due to the under chainstay placement are generally outweighed by the substantial benefits in efficiency and feel.
Know before you buy
No, this is a direct-mount caliper specifically designed for frames with chainstay-mounted brake bosses. Please ensure your bicycle frame is compatible with the direct chainstay mount standard before purchasing.
No, the RS811 is engineered exclusively for rear wheel application. It is not designed to fit or function correctly on the front fork.
Yes, the Shimano Ultegra RS811 typically ships with the necessary brake pads. We recommend verifying the specific retail packaging contents, but it is designed as a complete unit for rear braking.
The direct mount design attaches the caliper directly to the frame rather than using a single central bolt. This increases stiffness and reduces flex, resulting in a more responsive feel and more consistent stopping power.
Yes, as part of the Ultegra series, this caliper is designed to integrate seamlessly with other components in the Ultegra ecosystem. It will work with standard Shimano road brake levers.
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