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The V4 version not only receives the electronic impulses and sends them to the front and rear derailleurs
T20/T25 and a ¼ inch adaptor
The 30mm inner width assures tires put their entire width to the ground and don’t fold over as easily in corners
Compatibility: Blaze
efficient pedalling style
Shimano Ultegra Di2 ST-R8170 12 Speed Shifter + Flat Mount Caliper Size:Rear Brake - Left Hand The V4 version not onlyRoad riding has never been this much fun. The redesigned Shimano Ultegra Di2 ST R8170 12 Speed Shifter and Flat Mount Caliper has all new ergonomics, even more precise brake modulation and wireless electronic shifting, letting you focus on the next sprint, the next descent, or the next joke from your riding partner. Shimano's ULTEGRA ST R8170 brake levers bring enhanced modulation and control to every ride using Shimano's proven SERVO WAVE technology.
