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To outfit your Ultegra 6770, Ultegra 6870, or Dura-Ace 9070 Di2 bike, you will need five wire sections: front wire harness, down tube, front derailleur, rear derailleur, and battery. The front wire harness is sold separately, and is the only section that comes in just one length. Each of the remaining sections is available in three lengths--small, medium, and large. Refer to the size chart for available lengths, categorized by section.
One nice thing about the E-Tube system is that all the wires are the same, save for the length. This means that all the connections are identical, and it doesn't matter if your frame has internal or external routing.
Confused about how to build your Di2 Kit? Read our Learn Article.
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etube di2 wire
- Familiarity: I've used it several times
i am amazed how robust this wire is and how well it fits neatly inside the frame. i was kind of hesitant about electrical wire on a road bike. but shimano did a great job of building very robust protective shield around the major wires for protection. it is not easy to cut one of these wire's unless you deliberately set out to do just that. Good product and it looks like it will last a long time.