Description The EW-SD50 Rear Wires are the circulatory system of the Ultegra Di2 set up. You'll need four of these to connect the Front Wire/Junction to the Rear Junction Box, Battery, Front and Rear Derailleurs (all sold separately). They come in a wide variety of lengths to accommodate every bike out there (tandems too). If you end up with a wire that's slightly too long, it's possible to remove a few cm of slack at the junction box.
The Ultegra Di2 EW-SD50 Rear Wires are sold individually and are compatible with internal or external routed systems. The SM-GM01 and SM-GM02 Rubber Grommets are recommended for frames with internal cable routing. For external routing, add the SM-EWC2 Wire Covers for a sleek look.
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