Reviving this thread. After a season of racing, the same issue came up again. I put my bike on the trainer the other day and my left shifter was dead. Opened up the front end last night and found that all my cables going to the rear of the bike were sliced open. It even went through the heat shielding that placed over the cable.
This is actually the 3rd time this year that I have had to address this issue.
1) Is anyone else out there experiencing this?
2) Has the routing changed with the 2017 Bikes?
3) Has anyone thought of a better method to route?
Mine looks similar to yours, but the two Di2 wires going into the hole goes in much straighter, towards the back, along the top tube.
It therefore doesn't rub on the bottom edge of that hole.
One has a sleeve on it, and there are little marks, but nothing that appears close to rubbing through.
I only have about 100 (nontrainer) miles on it, so maybe I am just slower at accumulating that eventual fault.
I did put a layer of gorilla tape after seeing your first post about this and sure enough that tape was not pristine today. I put down a fresh layer.
Here's a pic: https://goo.gl/...os/PwJ1LHL6616MrjCCA