Shimano 105 ST-R7170-RE Di2 Shift/Brake Lever with BR-R7170 Hydraulic Disc Brake Caliper - Rear 12-Speed Flat Mount Black. The Shimano 105 ST-R7170 Di2 Shift/Brake lever features Di2 electronic shifting for precise intuitive gear changes to even more riders. The 105 BR-R7170 caliper features the Shimano Flat Mount System and its low-profile design that is ideal for road bikes.

Reach adjustment and customized button functions allow you to dial in your ideal ergonomics

Creates a clean cockpit with wireless connection and enhances the aesthetic of your bike while keeping shifting lightning fast

Easily change button function with the E-TUBE app

Includes 2 x CR1632 batteries

10% wider pad clearance decreases the chance of disc brake rotor rub

Maintenance-friendly one way bleeding process

Includes L03A Resin pads with finned alloy backplate