Originally Posted by
Jarrett2
I'm not up to speed on Di2, but isn't there a box or two that has to be connected to the frame somewhere? I assumed the carbon makers were putting them inside the frame. I don't see the same thing on the SRAM stuff. Looks a little more self contained and easier to port over to older frames.
Definitely easier to port over to old frames.
With Di2, and a frame designed for it, you can route the wires so the only exposed parts are a junction box, the size of a small cycle computer, typically obscured under the stem, a wire from the junction box to the frame, which runs with the rear brake cable, so no additional clutter, and a wire out the frame to the RD about a foot long.
So you're trading easier setup, and avoiding 18" of wire exposed, and a junction box, for keeping up with 4 batteries.
unless you're retrofitting an old frame I don't see that to be terribly compelling either way.
Question will be how well it shifts, and how reliable.
Also aesthetically, Dura Ace Di2, with a seatpost battery is sleeker than having batteries on each derailleur.