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Depends which shifters. I think DA have two ports in them whereas Ultegra and 785 or whatever they are only have a port in each shifter. If you only have an RD you probably don't need a Junction B if you can run a wire all the way to the front junction (Junc A). But if you're using the bar end junction, I don't know how many ports it has - is it enough for two shifters and a RD? Maybe it is with the Y splitter? But if it only has one port, you will only be able to plug in the shifters with the Y and then you're fucked with the RD.
hippy
Brommers
Basically, I’ve got shifters, a rear mech and a seatpost battery. I want to run this 1x.
I will ideally use the bar end junction/charging point thing.
Need everything else, have absolutely no idea what I need or what wires up to what