The Shimano Dura-Ace BR-R9100 is the top-tier rear rim brake calliper for road racing, engineered for riders who demand the ultimate in stopping power, modulation, and lightweight performance. Part of the R9100 Dura-Ace groupset, this calliper delivers a more predictable, linear braking curve and is engineered for compatibility with tyres up to 28C — giving modern race and endurance bikes the clearance they need without sacrificing aerodynamic efficiency.

Highlights

• SLR-EV dual-pivot design: Twin bearings and a roller reduce friction and flex, delivering smooth, progressive braking response with excellent feel at the lever.
• Pivot stabiliser: A stabiliser between the pivot axles minimises calliper deformation under braking load, adding rigidity and a more linear feel.
• Tighter arm spacing: Reduced gap between calliper arms creates a cleaner, more aerodynamic profile that complements modern race framesets.
• 28C tyre clearance: Engineered to accommodate wider tyres for improved comfort and grip on varied road surfaces without changing the compact form factor.
• R55C4 brake pads included: High-performance cartridge-type pads for alloy rims are included as standard; carbon-specific R55C4-A pads are available separately.
• Titanium hardware: Lightweight titanium pivots and fasteners contribute to the calliper's excellent weight-to-stiffness ratio.

SLR-EV Technology

SLR-EV (Super Linear Response — Enhanced Value) is Shimano's refined dual-pivot calliper architecture. By positioning twin bearings at each pivot point and adding a roller between the cable and brake arm, the design eliminates stick-slip friction that causes sudden, uncontrolled braking. The result is a linear, consistent brake feel that gives confident modulation even in wet conditions.

Compatibility & Fit

This rear calliper features a 49mm drop (CS-51 recessed bolt mount) with a 10.5mm sunken nut. It is designed for use with standard road fork/frame brake mounts. Compatible with all Shimano 11-speed road brake levers including the Dura-Ace ST-R9100/R9150, Ultegra ST-R8000, and 105 ST-R7000 series. Accepts rim widths of 20.8–28mm. Accepts Shimano R55C4 brake pads (alloy rims) or R55C4-A pads (carbon rims). This listing is for the rear calliper only.