Originally Posted by
tomato coupe
His chain dropped off on the inside, between the crank and the frame. There are two possibilities:
1. He was using a double chainring setup, and he was riding on the small chainring when the chain popped off to the inside.
2. He was using a single chainring setup, and the chain popped off to the inside.
Which was it?
I don't know. Only that chain drop is an issue.
On a designed for single / 1X either a narrow-wide or long tooth it is not very likely there would have been drop. But it can still happen, just (as I posted) never seen it.
The other thing is they swapped bikes, so it may have been chain between rings. I've had that happen on the tandem. Once in, it does not want to come out.