Originally Posted by LandSpeedRecord
If you use them as a jackshaft they do well since it spreads the load across so many more teeth.
But when they are used in the wheel they will only stay together with very weak motors and I imagine extremely tame riding.
If by 'tame motors' you are talking ~3.5hp like a souped up 66c two-stroke that sounds likely, never build a shifter over that without a internal engine tyranny, but all the internal shifter I have made have held up.
Again if you want more power, look at motorcycle parts.