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Your cart is empty.Shimano's simplified, modular wiring system for its Ultegra Di2 electronic shifting system is an improvement over the Dura-Ace Di2's wiring setup. Mounted to the cable guide beneath the bottom bracket shell (for externally wired systems), the junction box neatly and securely connects the wires running from the front derailleur, rear derailleur, shift levers and battery, powering and integrating the entire system.
ShopLocalNotHere
Reviewed in the United States on April 8, 2017
great
V. Nuñez
Reviewed in the United States on January 7, 2015
Item as described, very small..fast delivery
sch
Reviewed in the United States on April 25, 2015
Works well as under BB junction. No problems, sent promptly by vendor.
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