From PSWPower
Bafang 8FUN BBS0101B/BBS02B kit pinion gear for replacement
10mm diameter for old version BBS01/BBS02
12mm diameter for new version BBS01B/BBS02B
So this pinion gear can not fits BBS01/BBS02/BBSHD bafang mid motor
if you buy wrong item, we can not accept return parcel
Packing list:
1 pcs pinion gear