Shimano SM-JC41 Di2 Internal Junction B Box AI Sold as a single pair

Sold as a single pair (2 pads)

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Shimano SM-JC41 Di2 Internal Junction B Box AI Sold as a single pairFor 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. Specifications For internal wire routing Mfr Claimed Weight 4. 1g