I am adding Ultegra di2 to my P4. I will be using my own battery and switches.
I plan to put all electronics in the frame and seat post. It would seem that it would be possible, but maybe difficult, to wire the bike without drilling any holes. I need the following wire runs done inside the frame
1) Cable from aero bars into the frame and come out in the seat post
2) Cable from the seat post to FD
3) Cable form the seat post to RD
My frame is a 2011.
Curious if anyone has done this and how. Thanks for any help!