Shimano Ultegra Di2 ST-R8170 Hydraulic Disc Shifter Set 2X12 Speed. Shimano Ultegra Di2 ST-R8170 STI brake/shift lever. Group: Shimano DI2 Electronic. Shifter Lever: Shift Brake Lever Set. The ST-R8170 STI levers are not only characterised by their optimised ergonomics and even more precise dosing of the hydraulic disc brakes, but also impress above all with lightning-fast shifting processes, which are achieved not least through theWireless functionality.
