Bafang Install on 73mm Bottom Bracket
Bafang BBS02 750W Motor Installation on a 73mm bottom bracket
When installing the BBS02 750W motor on a 73mm bottom bracket, the outer lockring may not fit. You may need to use extra washers and
longer M6x20 bolts. If you want, you can use Loctite on the threads of your axle instead of using the outer lockring.