My chain slipped off my chainring while riding today, lassoed my rear wheel, and tore off my rear derailleur.
Not knowing much about derailleurs, do I need to replace it with the exact make and model, or do I have some choices? Any recommendations?
It's a Shimano RD-MC38.
I'd also appreciate any tips in how to avoid my chain coming off willy nilly. It's not the first time this has happened. Last time, it bent my chainring.
