My wife has tendonitis in her wrists and is finding manual gear shifting to be a problem, so I'm looking into upgrading her bike to a simple push button Di2 system (rather than the sram wireless which still seems to need a bit of "throw" on the levers to change gear).
The bike is currently 11-speed 105 (5800) throughout, with 50-34 front, 11-32 rear cogs.
I'm hoping someone can describe which components I'd need to purchase to switch this over to an Ultegra Di2 system. I'm simply confused by the variety of pieces which make up the system (A junction, B junction, battery model, etc).
As far as I can see, I will need at least:
- Left and right shifters
- Battery (seat post or external ?)
- Front mech
- Rear mech with long cage
- Some sort of junction box
I'm hoping that the existing cassette, crankset and rim brakes can be kept.
Cabling-wise, it's frame-internal apart from the run from the bottom bracket to the rear derailleur which is bare cable external under the chain stay.
I can see that there are internal and external battery options, various mounting options and I'm basically overwhelmed by the choices. If there's a simple step-by-step guide out there, I haven't found it.
Suggestions, alternatives all welcome - thank you...