For inside DI2 cord routing, Shimano’s SM-JC41 Junction B is the central connector for DI2 methods. Wires from the entrance and rear derailleurs, cockpit space, and battery all plug into the 4-port SM-JC41 junction, which is housed throughout the motorbike body.SM-JC41 E-tube cable junction for inside cord routingJunction is needed for connection of rear mech, entrance mech, battery, and cable to battery indicator junction boxTo be located well inside of body tubing when connectedCables bought separatelyReliable and protected water-proof connectors
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