A Shimano EW-SD50 E-tube Di2 Electric Wire 1000mm is required to connect the junction (either SM-JC40 external or SM-JC41 internal) to the rear mech; front mech; battery and to the handlebar battery indicator junction box.
Shimano EW-SD50 E-tube Di2 Electric Wire 1000mm
GBP 20.19 GBP 20.19

