owhite
100 W
- Joined
- Aug 3, 2020
- Messages
- 290
It depends how much power you're running, but you should definitely look up the power rating of a 8m belt at that width, I doubt it's capable of carrying the torque that these motors are capable of.
you make a good point (and your user name definitely checks out)
The motor is designed to be a drop in for the surron, which uses a two stage gearing system:

So I assume we have lower torque on the input side of that gear box, which is fine for that size pulley/belt, but it's not a good match for a direct drive system to back wheel.
This would be a compelling reason to lose the pulley and put on a metal sprocket. That would also allow to use smaller teeth so the back sprocket doesnt need to be as large as originally calculated with the existing belt drive.