Badly bent chainwheel (front sprocket), advice please!
So the story goes:
I lent my old peugeot to a friend to ride around and he calls me one night telling me something went badly wrong. Turns out the the front sprocket that attaches to the crank is bent... not just a little bent... bent nearly in half. My friend claims he didn't crash it or anything... he was just riding along and next thing he knew, bam! I'm not sure whether to believe him, but I'm wondering if it could have something to do with how the bike was converted to a single speed... like maybe too much pressure put on the chainwheel or something... plus he's a pretty big guy, about 240lb. Any thoughts on the cause, and also, do I need a completely new crank or just a new chainwheel... thanks for any advice!