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In terms of kit the minimum you'll need is:
- 1 battery
- 1 Junction A
- 1 rear derailleur
- 1 2-button shifter (climbers or TT type) or 2 1-button TT shifters.
- Cables to string it all together
- Probably a B junction to connect everything together
In terms of mods to the frame, you'll need to drill a hole in the top tube just behind the headtube for the Di2 cable to go into. You'll then need some way of getting it out of the downtube - on the P2 I just used the normal cable exit port, which was big enough to get a Di2 cable end out of. Assuming you're putting the battery in the seat tube, you'll also need to open up the hole for the FD behind the BB shell and on the shelf on top of the chainstays. Working out how to cable it all together depends on whether there are any internal bulkheads in the frame. On the P2 it's possible to thread a wire directly from the seat tube, past the bottom bracket, and down into the chainstay.
On the P2 there's a hole at the rear of the chainstay which I used to get the RD cable out, and then used some Sugru to hold it in place around the seatstay. It looks like there may be no equivalent hole on the P3, so you might need to run the RD cable out through the bottom of the BB, and then along the outside of the DS chainstay underneath it.
The big challenge might be the battery. The standard Di2 internal battery is, I think, 17mm wide and I don't think it would've fitted in the seat-tube on the P2. For me it didn't matter as I'd hacked an external battery to make an internal one, and it is much smaller than the factory version. Details here.
- 1 battery
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Brommers
danb
After having the misfortune of having to recable the rear gear cable through the bastard internal routing again last night I am seriously considering Di2. The FD is currently acting as an adjustable guide for the single ring up front so I only need an electronic shifter and rear mech (and battery, wires, etc) as I'm happy to keep this as mechanical (I'd assume it's more aero too)
What's the bare minimum I need, or cheapest options for this?
What mods do I need to make to the frame in order to take a battery and wires internally to the rear derailleur? @skinny @danstuff ?
I'd probably also take this as an opportunity to change to 11 speed as my wheels can all accept 11sp cassettes, and I assume 10sp Di2 is harder to obtain/maintain/pricier.