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Shimano Ultegra Di2 SM-JC40 External Junction Box View Larger Image

The Shimano Di2 SM-JC40 External Junction Box goes underneath the bottom bracket and mounts where a cable guide is usually located. The included screw threads into the hole that is normally used for the cable guide mounting screw. The Junction box is aptly named as all 4 Ultegra Di2 connecting wires emanate from the Junction Box.

Features

  • 10 grams
  • Includes mounting screws
  • Attaches to bottom bracket cable guide mount

Shimano Ultegra Di2 SM-JC40 External Junction Box

Reg Price: $34.95
Item #: 111540 Weight: 10g
Quantity:
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