Originally Posted by
wsteve464
If you really have your heart set on internal routing you can strip off the black outer insulation from the E-tube and have 2 smaller wires to run through the head tube. The black insulation is pretty tough and you would need to be careful not to cut the insulation on the inner wires. Alternatively you can cut the Di2 wire and solder in an extension using small gauge wire, like the wire inside a usb cable. I just finished a Di2 installation with splices to do the same sort of thing the only wire showing is at the derailleurs.
Good luck
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