Changes to the BBS01/02 drive train . . . what to do!
Bafang apparently decided to beef up the drive train on the BBS 01/02 series mid drives which affects the pinion gear, the pinion gear support plate and the nylon gear. Unfortunately they have also apparently decided to not continue making the old-style pinion gears and nylon gears. See the comparison images below.
Click on the images above to link to that product.
If your mid drive has the older version components and you need to replace any of them, you will need to replace all 3. We are sorry for the inconvenience but we will always do our best to help you keep your bike on the road.