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Rather than Y cable, can’t you just wire one shifter to the other, one cable to the junction box and one cable from whatever free port to the internal junction A cable? No soldering needed.
Didn’t think Di2 was fussy about where things were connected, just that they were connected.
I think this is how I wired mine in my Superzero bars (which are awkward as they have a cable channel under the tops, but the only way you can go internal is through the drilled holes near the bar ends)
Acliff-
Thats how my partners bike is wired:
Shifter
- Cable
Shifter - Cable
Bar End - Cable to rest of bike
- Cable
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yeah this was my plan, need to figure out what predrilled bars to get though.
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Rather than Y cable, can’t you just wire one shifter to the other, one cable to the junction box and one cable from whatever free port to the internal junction A cable? No soldering needed.
Can do, yes. It's a total bugger to run the cables, particularly if you want one cable running all the way from one shifter to a Junction A in the downtube or seattube inside the bars. It's doable though.
thanksbye
gillies
Brommers
No need for an external junction box - the 910 bar end shifter does that job. You will need an internal A junction to tie everything together, and probably a Y cable for the bars if you're using the bar end junction box. Or a soldering iron.