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Because there's no junction boxes any more and only the two derailleurs are attached to the battery so it has to go via one of them
The whole system is literally just shifters attached to nothing, two derailleurs attached to a battery with one wire each. Done. Don't need 8 wires and 2 junctions any more.
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I see, so you get fucked on the price but you don't have to buy 2 x junc and maybe some cables. If I want to run cables from the levers though, do they run to the FD only or both FD and RD? With no junc box, that's a long cable run.
So, if you fuck the RD cable for example and it's like 1.5m long and run through the whole bike, that becomes a not so easy replacement.
Is there no way around that charging on the move issue? Why did they move the charging to the RD?
There's no way I'd be dangling bits off the back of the bike to a moving RD to charge.