[rblatz]

Or a nonlinear junction detector? https://en.wikipedia.org/wiki/Nonlinear_junction_detector

[duskwuff]

Any contact between two dissimilar metals (e.g, steel and aluminum) creates a nonlinear junction. Bicycles are full of those.

[rblatz]

I thought most competition road bikes were almost entirely carbon fiber. At least in the frame. Where it sounds like you have to hide the motor, batteries, and wires.