Took about half an hour to fit all the wires inside my frame.
You’ve not tried wiring up time trial bars and a frame that wasn’t designed for Di2 😉
Got to say though, it is all pretty cool. Once you know that a junction box is just that, and you can pretty much plug anything in anywhere as it’s all on a bus, it’s brilliant. I think I’ve about 4 B junction, 1 A junction and a load of cables in my installation.
I have the ANT+ dongle thingy
Oh just ordered one of these. What do you use it for? My A junction is in the frame so getting it mostly to see the battery level, though might be pretty cool to be able to see stuff like gear selection too.
is it wise to test it before fitting to the bike or is it going to mess it up ?
Usually a good idea to test it while it’s all still fairly accessible. I’d already fitted most of mine but could still get to the important bits just in case.