Shimano Front Wire Harness for Ultegra Di2,Shimano Ultegra FD-R8150 Di2 Front Derailleur - 2x12-Speed, Braze-on, Down Swing, For 50-54t Max, Black/Silver,Shimano Ultegra Di2 R8170 12speed Titanium Screw Shift and Brake Kit,Shimano Ultegra R8050 Di2 11 Speed Electronic Rim Brake Triathlon TT G – Elevate Cycling,Patent Patrol: Next Shimano Di2 Could Be 13-speed, Fully Wireless, Even Electric Brakes? - Bikerumor