Shimano Ultegra BR-R8170 Hydraulic Flat Mount Disc-Brake Caliper, Left Front

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Shimano Ultegra BR-R8170 Hydraulic Flat Mount Disc-Brake Caliper, Left Front


With the Shimano BR-R8170 flat-mount brake caliper from the Ultegra road bike groupset, the brake pads have more free space than with the predecessor model, which prevents grinding of the brake rotor and reduces noise. The braking power of the two plastic pistons is tuned for competition use, but is just as suitable for leisure and training rides. In addition, BR-R8170 features a simple bleeding process thanks to One-Way Bleeding technology. The two-piece caliper design is made of lightweight aluminum and comes with Ice-Tech resin pads, which ensure particularly good heat dissipation thanks to their cooling fins. However, you can also ride it with conventional pads.


Series: Ultegra R8170
Application: Road
Type: hydraulic, 2 pistons
Actuation: mineral oil
Hose: SM-BH90-JK-SSR (not included)

Technical Information - Caliper:

Caliper Mount: flat mount
Pistons: resin
Pads: L03A resin with cooling fins
Design: 2-piece
Caliper Material: aluminum
Hose Connection: straight


Brake Rotor: 140 mm, 160 mm, 180 mm (recommended: RT-MT800)
Pads: Standard and Ice-Tech brake pads
Recommended Brake Lever: ST-R8170


- 10 % larger brake pad spacing minimizes grinding of the brake rotor, less noise development
- braking performance optimally tuned for racing and training use
- coherent appearance and easy tool access thanks to flat mount
- optimized heat dissipation with Ice-Tech
- simple bleeding process
- 2 pistons made of synthetic resin
- painted
- steel bolts (4 mm)


One Way Bleeding is a technique used on the brake caliper that makes it easier to bleed the brake. The hose routing has been optimized so that no air bubbles remain in the brake caliper. In combination with the funnel, the brake can be bled cleanly and easily.

Manufacturer Numbers:

Front Flat Mount: I-BRR8170F6RF


- 1 x Shimano Ultegra BR-R8170 brake caliper
- 1 x pair Shimano L03A brake pads
- 1 x disc brake adapter (front only, pre-mounted for 160 mm)
- 2 x type A caliper bolts (front)
- 2 x caliper bolts for 25 mm frame diameters (rear)

Gram Weight:

  • anthracite/front flat mount: 146 g (Grams)