so my pedalling was slipping badly, the only thing I see is the cassette and gears are super loose. then I find this plastic washed pop out from inside where the axle is. and I tried loosening/tightening the cassette. neither work, maybe it's jammed? but it's loose, and the gears are sliding across each other a lot. when I try to pedal, it slips if I put any weight on it.
by Shawberies