Originally Posted by
ThermionicScott
The same place you buy your 9- and 10-speed freewheels.

For reasons I'm still trying to understand, freewheels are the main choice for e-bikes and conversions...
Now see, that's why I don't bet on this kind of stuff. Who ever would have thought?
I test rode an e-boosted fat tire bike yesterday while I was at the bike shop buying shoes. If I had known, I would have checked to see if it had a freewheel or cassette.