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Shimano SM-JC41 4 Port Junction Unit SD50
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.Frame Junction Box connects via SD50 E-tube wires to four different points: front derailleur, rear derailleur, cockpit junction box and battery mount
Compatible with:
- Dura Ace Di2 9070
- Dura Ace Di2 R9150
- Ultegra Di2 6770
- Ultegra Di2 6870
- Alfine Di2
Thanks! We will notify you when this product becomes available!
