Shimano Di2 SM-JC41 Junction Box

This is the Shimano Ultegra Di2 Internal Junction Box. This box is referred to as the junction box "B" on a Di2 build. The SM-JC41 is for use with internal wiring setups and is the main centre of e-tube Di2 systems.

Good to know

• Check the part matches your groupset generation and speed.
• Keep batteries charged and firmware updated.
• We can install, pair and set up electronic groupsets.

Shimano is the world's biggest bike component maker, and genuine Shimano parts give the best fit and function on Shimano groupsets.

Sold by Chop Shop, an independent bike workshop at 81 Regent Street, Chippendale, Sydney. Not sure it suits your bike? Call or text Ollie on 0451 872 894 before you order, or have it fitted in the workshop.