Junction-B SM-CJ41 Internal wires, for internal DI2 cable routing, junction B SM-JC41 by SHIMANO is the central connector for DI2 systems. The cables of the derailleur and gearbox, dashboard and battery are all inserted in the 4-port junction SM-JC41, inserted inside the frame of the bike.

• Sales model code: SM-JC41.
• Shimano article number: Small parts.
• Cycling discipline: E-Bike / Di2 / E-tube.
• Use: By bike.