Shimano 105 Di2 ST-R7170-R / BR-R7170 Rear Hydraulic Disc Brake and Shifter Set. This high-performance kit is designed for road cyclists, combining a 12-speed wireless electronic shifter with a hydraulic brake caliper.
Shifter/Lever: Shimano 105 Di2 ST-R7170-R Dual Control Lever for right-hand mounting.
Brake Caliper: Shimano 105 BR-R7170 Hydraulic Caliper with a low-profile Flat Mount design.
Hose: Includes a 1700mm SM-BH90-JK-SSR hydraulic hose.
Power Source: The wireless shifter is powered by two CR1632 batteries, offering an estimated life of 3.5 to 4 years.