Shimano R8170 Ultegra Di2 Shifter and Brake - Left

What Does the Shimano Ultegra R8170 Di2 Left Lever Control?

The Shimano ST-R8170 left lever is the front brake and front derailleur shift control for the 12-speed Ultegra Di2 hydraulic disc brake system, combining wireless electronic shifting with SERVO-WAVE hydraulic braking in a single ergonomically refined lever body. Wireless Di2 connectivity eliminates the shift cable entirely between lever and front derailleur, sending commands via Bluetooth LE through the BT-DN300 battery to the FD-R8150. The redesigned hood profile -- shaped with input from professional riders -- raises the peak for improved grip and comfort across long rides, and the larger lever blade makes confident actuation easier with gloves or cold hands. Reach and free stroke are adjustable for custom fit.

Pairs with the ST-R8170 right lever to form the complete Ultegra Di2 12-speed hydraulic disc brake system. Works with the BR-R8170 flat-mount hydraulic disc caliper (sold separately or as a set). Compatible with SD300 satellite shifters for additional shift points in the drops or on the bar top. Synchro-Shift and Semi-Synchro-Shift modes configurable via the E-Tube Project app. Uses CR1632 coin cell battery with approximately 1.5 to 2 years of life. Left lever only -- sold individually.