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Shimano Di2 SM-JC41 B Junction Box (Internal) - Performance Bicycle
![Universal Cycles -- Shimano E-Tube Di2 Frame Junction Boxes [ISMJC40, ISMJC41]](https://www.universalcycles.com/images//products/small/49102.jpg "Universal Cycles -- Shimano E-Tube Di2 Frame Junction Boxes [ISMJC40, ISMJC41]")
Universal Cycles -- Shimano E-Tube Di2 Frame Junction Boxes [ISMJC40, ISMJC41]
