Bafang BBS01 Nylon Gear
This is the primary reduction gear for the BBS01 drive unit. You need to remove the motor and controller to change and it is about an hour long job.
To troubleshoot your BBS01 to see if the Nylon gear has failed
To repair a melted gear please (Click here for instructions on replacing the Nylon gear)
NOTE THIS IS ONLY FOR BBS01