Shimano Ultegra BR-R8170 Rear Disc Brake Caliper

Engineered to deliver confident control with less fuss, Shimanos Ultegra BR-R8170 brings a quicker initial bite and smoother modulation in a compact, quiet package. A 10% increase in pad-to-rotor clearance reduces rub and makes wheel swaps simpler, while Shimanos One-Way Bleeding layout streamlines maintenance. Pair with ICE TECHNOLOGIES pads and rotors for stable performance on long descents.

Why youll love it

• Quieter running: 10% wider pad clearance helps minimise rotor rub.

• Easy service: One-Way Bleeding design for cleaner, quicker bleeds.

• Heat management ready: compatible with Shimano ICE TECHNOLOGIES fins/rotors for consistent braking on big hills.

• Controlled power: opposed 2-piston design with large 22 mm ceramic pistons for modulation and fade resistance.

Key specifications

• Mount: Flat mount (road)

• Rotors: 140 mm or 160 mm with the correct flat-mount adapters (front/rear as applicable)

• Pads (examples): Resin fin L05A-RF, Metal fin L04C-MF, plus K-series options (K05Ti/K04Ti/K05S/K04S).

• Fluid: Shimano mineral oil

• Recommended system: Use with Shimano SM-RT ICE TECHNOLOGIES rotors (e.g., SM-RT800).

In the box

Caliper (front or rear, as selected) with pre-installed pads, fixing hardware; rotor/adapters sold separately. (Check listing contents for exact pad spec supplied.)

Fit notes

• Flat-mount frames/forks only; choose the right adapter for 140/160 mm rotor size.

• For best results and quieter performance, use ICE TECHNOLOGIES pads/rotors and observe Shimano torque/bleed guidelines.