Shimano Ultegra R8170 Rear Brake Caliper

Shimano Ultegra BR-R8170 Flat Mount Rear Brake Caliper
Ultegra R8100 – Leave Time Behind

When developing the Ultegra R8100 series, Shimano took a holistic and 100% performance-oriented approach, because with great speed comes great responsibility. Faster than ever, the 12-speed groupset for road bikes offers unmatched control and comfort anytime, anywhere, whether you're in a race for all audiences, in pursuit of a personal best time or in a walk in company

As with the Dura Ace R9200, Hyperglide+ is not only incorporated into the Ultegra's components, but its Di2 parts are also based on wireless technology to further simplify operation and ensure smooth shifting.
Shimano Ultegra BR-R8170 Disc Brake Caliper

Improved in every way, the Shimano Ultegra BR-R8170 caliper offers optimized dosage, quieter braking performance and greatly simplified maintenance.

While a quicker initial braking force always gives the feeling of total control, the 10% increase in brake pad clearance allows for a significant reduction in noise during braking, despite an overall flatter design. Also, when using the RT-MT900 brake rotor (sold separately), its warp-resistant design, even with increased heat, helps create an extremely quiet and smooth braking system.

To simplify maintenance, the 2-piston hydraulic brake caliper not only features the proven One-Way-Bleeding system, but also a separate bleeding nipple and opening screw. On the one hand, this minimizes the risk of the bleed kit hose coming off when opening or closing the system and, on the other hand, it makes it unnecessary to remove the caliper from the frame for the bleeding process.

Material:
brake caliper: aluminum (painted)
pistons: resin

Compatibility:

STI lever: ST-R9270, ST-R8170
additional brake lever: BL-RX812
brake disc: RT-MT800
brake pad: K03S Resin, L03A Resin, L04C Metal
brake hose: SM-BH90-J-SSR, SM-BH90-JK-SSR

Weight (manufacturer data):
approx. 146 grams (front)

approx. 136 grams (rear)