Is it possible to mount Shimano Ultegra 6870 Di2 on a 2012 Cannondale SuperSix? I was just wondering if it was possible to fit the 6870 Di2 on a 2012 Cannondale SuperSix ? It has no internal wiring. I think the 6870 Di2 has a new round long battery that only goes in the seat post. I don't think I could get a wire out of the top of the seat post.

Here is an internet picture of my 2012 cannodale supersix



I was told on another forum that the battery should fit the seatpost. 

I guess I could drill a hole in the frame but it would void the warranty.
I wouldn't modify a carbon frame as it'd be difficult to detect the beginnings of delamination where you drill it.

Internal wiring is optional. You'll need an SM-JC40 for external wiring, a SM-BTR1 and SM-BCR1. The charger which connects to the front junction will only charge internal batteries.