Riding home yesterday, giving it beans in the third ring. Dropped down to the middle ring to start climbing and the drivetrain locked solid. Stopped to check, and the chain’s come up round the ring from the return path, all the way up into the front derailleur, and wedged itself tight on the outside of the mech.
My question is, is this chainsuck? Moreover, is there anything other than a worn chain that could cause this? Could it just be bad luck and a one-off, is it maybe a lack of lube or a damaged link, or a problem with the mech or something, or do I need to be looking at getting a new chain as a matter of urgency? Anything specific I should be checking?
Chain is a KMC X9SL (I believe) and done about 200 miles. I’ll be somewhat surprised and disappointed if it needs replacing already, it looks almost new and I’ve not had any problems with it previously.
Cheers in advance.