I’m not going to be able to do that in this frame unfortunately.
Are you sure?
the frame is old and has no internal routing for wires
You're only routing a cable out from the seat tube, then down along the trad mechanial cable path.
What frame is it? You should easily be able to drill a small exit hole out the bottom of the BB, assuming there isn't one. Pretty sure I've drilled a water escape hole in every steel frame I've had that didn't already have one.
It’s a 2012 carbon Storck that had external cable guides that I had removed when I had it painted a few years ago.
I’m not keen on the thought of drilling into Carbon
It's a pretty beefy BB.
Might be worth asking a pro for their take. I wonder if you could sacrifice the 2nd bottle and then route through on of the bottle boss holes?
Are you sure?
You're only routing a cable out from the seat tube, then down along the trad mechanial cable path.
What frame is it? You should easily be able to drill a small exit hole out the bottom of the BB, assuming there isn't one. Pretty sure I've drilled a water escape hole in every steel frame I've had that didn't already have one.