Originally Posted by bmcer

Just completed the exact same conversion. It left me with one hydraulic line going to the rear brake through the frame, one hydraulic line to the front brake via a fork leg and one Di2 wire going from the A junction box into the frame via one of the ports in the head tube.

BTW, this is an Ultegra installation. I've run a Campy Record EPS v3 group on my other bike for years, and for my money, the Di2 set up shifts more cleanly and quietly by a significant margin. Forgive me this piece of blasphemy, but it's true