The Shimano 105 BR-R7170 Disc Brake caliper combines with the R7170 Di2 Dual Control lever design to deliver better modulation, a quieter disc brake system, and an easier-than-ever bleed process. The dual piston design moves purely, with a resin piston that also saves weight and cost. Shimano's caliper redesign for 12-Speed groups answered the challenges driven by pro and everyday cyclists alike by delivering 10% wider pad clearance and reduced heat. Less rub, and in combination with the newest rotors, less distortion in the rotor itself under heavy braking loads, particularly while descending. Another real improvement was made via the caliper design to better optimize and simplify the One Way Bleed system, which make maintenance simpler and more effective. Despite its smaller construction, the system is quieter than ever and easier to maintain.

The R7170 calipers are sold separately, Front or Rear, and include Shimano's dictated hardware (some frame or fork designs may require longer or shorter fixing bolts). If you don't have a hydraulic hose kit from an existing set-up or new levers, you will need the Shimano SM-BH90-JK-SSR or the SM-BH90-J-SSR model. Finned disc brake pads developed with Ice Technologies reduce heat and offer quiet stopping power.