Originally Posted by
70sSanO
I “think” the chain drops from the 10th and 11th cogs to the 9th. I “think” that is the “chain came off” meaning. It came off one cog to another.
You mean that by "chain came off" the OP refers to autoshifting in the rear? But why does the OP use the words "came off"? A rather weird choice of words. And how did the OP managed to "crash" then? I mean, I can imagine a combination of adverse circumstances in which sudden autoshift might result in a crash... but still...