Shimano Dura-Ace Di2 Electronic External Rear Wiring Kit

Shimano's Dura-Ace Di2 takes shifting to the next level. The Rear Wiring Kit connects to both the left and right shifters and Junction Box A (which displays battery power and allows manual adjusting). It also includes a battery mount, cable covers to route and hide the cables and a wire plug/unplug tool. The External Kit is meant to be run on the outside of the frame.

Most 53 to 59cm frames use a Medium (830mm) Rear Wiring Kit. See our diagram to learn how to measure for the right kit. If you are unsure, please contact us for assistance.

The Rear Wiring Kit is the wiring that runs from the stem/bar junction to the battery and derailleurs.