Looks like a loose battery has killed the seat tube cable in the grrl's bike.
650mm one of these likely to be enough to replace it? https://www.wiggle.co.uk/shimano-ew-sd50-e-tube-di2-cable
If the B junction is right by the BB, yeah
Shit, fair point. I didn't build it and I'm not sure I can take the BB off to check.
Cranks should come off with allen key, BB might be GXP - does that use BB9 tool?
@PhilDAS started
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Looks like a loose battery has killed the seat tube cable in the grrl's bike.
650mm one of these likely to be enough to replace it?
https://www.wiggle.co.uk/shimano-ew-sd50-e-tube-di2-cable