E-Tube Cabling For Di2
The Di2 EW-SD50 Wires are the "E-Tube cables" for Shimano's Ultegra 6770, 6870, r8000 and Dura-Ace 9070 and r9100 groupsets. They're used to connect each of the electronic components within either system.
You'll need four of these to connect the Front Wire/Junction (A) to the Rear Junction Box (B), Battery, Front and Rear Derailleurs (all sold separately). r8000 and r9100 groupsets require 6 total, so plan accordingly.
These are sold individually. To recap, four wires are required per bike for previous Ultegra versions, and six wires are required per bike for current Ultegra and Dura-Ace, r8000 and r9100 groupsets. Choose from various lengths for a perfect fit*. Compatible with internally or externally 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 an additional aesthetic touch.
*Note: Additional wire slack can be taken up at the Rear Junction (B). When in doubt, it's best to order a slightly longer wire.
The product weight specified is an approximate weight based on the manufacturer's specifications (if available) or our measurement of one or two examples. For most products, the weight will typically vary by 5% to 10%.