Got up early last week to go mtn biking, but my chainring had other ideas. What's happened here is one of my chainring bolts was loose, fell out, and then the chainring failed. This is due to poor maintenance.
Top view
Side view with parts
With only 3 of the 4 chainring bolts, the chainring was being pulled to the inside of the bike more than normal, and it caused it to fold over.
Chain in blue
Lesson learned: Give your bike the once over every now and then.
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