JUNCTION-B, SM-JC41, FOR INTERNAL WIRE ROUTING FRAME, IND.PACK

For internal DI2 wire routing, SHIMANO's SM-JC41 Junction B is the central connector for DI2 systems. Wires from the front and rear derailleurs, cockpit area, and battery all plug into the 4-port SM-JC41 junction, which is housed inside the bike frame.