Shimano Dura-Ace Di2 ST-R9170 Shifter Only (Disc Brake) BPW SRAM pioneered the 1x drivetrain

SRAM pioneered the 1x drivetrain

Tubular (or inserted into latex/butyl inner tube): up to 1 year

and special FP AERO Bending for superior handling

With this adaptor piece

whilst the design elements take inspiration from the aerodynamics of the brake and are enhanced by the new sealed structure of the brake levers themselves

Shimano Dura-Ace Di2 ST-R9170 Shifter Only (Disc Brake) BPW SRAM pioneered the 1x drivetrainWith a compact overall shape, the DURA ACE R9170 levers bring both SHIMANO's praised hydraulic disc brake technology and the category leading DI2 electronic shifting in a package ready for the most demanding of race situations. An updated button feel and layout ensure precise shifting while enhanced ergonomics guarantee comfort, allowing you to concentrate on the effort at hand. Specifications Left or Right Di2 Shifter (Choose from drop down menu)