Shimano Ultegra Di2 Wiring Kit
Ultegra Di2 wiring kits represent an improvement over first generation Dura-Ace Di2 wires because Ultegra Di2 use smaller 2 core wires instead of the 4 core used on first generation. Ultegra Di2 wires are compatible for both internal and external routing so there is no need to buy separate internal or external kits.
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