Originally Posted by
Trevtassie
I got some thin black truck airline. Looks like cable outer, ran that along the top tube using the cable mounts already there, then down onto the rack, wire goes inside.
I've used brake cable housing with a wire inside for the computer sensor connection on my folding commuter bike. The metal spiral serves as one connector and the wire is the other. It's almost bullet-proof... not a bad thing where the bike parts are constantly being folded and realigned.