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.
Smaller 2 core wires
Snap-in waterproof connection
Compatible for both internal or external routing
Showing Questions 1 of 1
Q: Can you give me some advice on how to measure the bike frame for the wire lengths needed, please. Can I just measure from point to point with a measuring tape? thanks k
A: The measurement would have to be in segments. From one point to another in conjunction with the cable boxes, batteries, and drivetrain. Always measure with tape and add 200mm for safe measurement.