CoMotion Robusta DI2 conversion....
Well, I've had the parts sitting on my bench for 5 months, so I figured it was time to get this done. I'm using the FSA MegaExo triple cranks, and just pulling the inner ring. That will, for now, get us a 39/52. I'm ordering a 38 tomorrow as I figure I should grab as small a ring as the 130 BCD will allow. We're already running an 11-28 cogset, which, for us gets us enough gears for Mt Lemmon here in Tucson. I'll be trialing an 11-30/32 to see how it flies with the DI2 rear der sometime soon.
I purchased the wiring harness and seatpost battery for this setup from Gene Poyorena of DIY DI2. He did the same setup for my custom Gilmour single, and it worked out great!
FB page here: https://www.facebook.com/Di2SeatPostBatteryKits
The only "glitch" I'm wrestling with is the crank alignment and rear derailleur. Since the DI2 is a double, it looks like there may not be enough adjustment to pull it out to the location of the outer 2 rings of the stock triple that I want to use. Does anyone know if it's kosher to just move the cup spacer from the right side, over to the left and run none on the right and two on the left? From what I see on the FSA website, this looks like it's commonly done in bikes of varying BB shell widths?
Otherwise, the install went very straightforward. I will add pics of the bike/details of the fitment tomorrow.