esc for e-bike ?

[BrianG]

I personally would use a couple of 555 timers (or a single 556 timer) and make my own servo tester. One thing to think about for whatever you use: design it such that if the "wiper arm" of the pot opens up (gets worn), the ESC should go to neutral, not WOT. Pots do wear out and it would suck to slam WOT into a stationary object...