Shimano SM-JC41 Junction Box for Ultegra Di2

Shimano SM-JC41 Junction Box for Ultegra Di2

Ref. 51458

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For internal DI2 wire routing, the Shimano SM-JC41 B-junction is the central connector for DI2 systems. The wires from the front and rear derailleurs, the cockpit and the battery all connect to the SM-JC41 4-port junction, which is housed in the bike frame.


  • Brand Shimano
  • Reference 51458
  • EAN13 4524667827467
  • Manufacturer reference ISMJC41

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