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Shimano Di2 SM-JC40 Junction B Box

Item #: EL250D01
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Shimano Di2 SM-JC40 Junction B Box

The Ultegra Di2 junction box can be viewed as the brains of the operation. All of the wires and battery plug into the junction box.
5.0 / 5.0
2 Reviews
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JC40 Junction box
Just wanted to try electronic shifting and now I'm hooked on it. There was no problem with my mechanical shifting, this is just nicer.

PROS: Easy to fit
October 7, 2015
Location:
Rhode Island
External Junction Box
Installed easily E wires simple to install in it

PROS: Light Weight, Easy To Install
October 25, 2015
Location:
Rhode Island

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Get free shipping with your $50 purchase today when you choose Standard Shipping at checkout. Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items

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Free Shipping Offer

Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.