Hayes D-Series Rotor DMZ The redesigned Shimano Ultegra Di2

The redesigned Shimano Ultegra Di2 ST-R8170 12 Speed Shifter and Flat Mount Caliper has all-new ergonomics

When weight and storage in your pocket or saddlebag is important for you

29% elastane

super bright red LED rear light provides 40 lumens and hides beneath the saddle with included Duo Fixer which allows fast and easy tool-free mounting and removal

Hayes D-Series Rotor DMZ The redesigned Shimano Ultegra Di2Developed to work specifically with our Dominion platform, the D Series rotor offers superior braking performance without any annoying howls or vibrations. Features MRC (Modal Resonance Cancelation) cancels out noise and vibration via FEA optimized modal shapes cut into the rotor1. 95 mm material thickness enhances heat dissipationQuickBite provides the shortest path to high performance through fast and consistent burnishing Mfr Claimed Weight TBC