S-Parts Titanium Drivechain Bolt Kit - Compatible with Shimano Ultegra R8150, R8170 & Dura Ace R9250, R9270. Shimano Ultegra Di2 R8150 / R8170 + Dura-Ace Di2 R9250 / R9270 Compatible. This is the full hardware refresh your Shimano Di2 build deserves.
