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I'm certain it wasn't - although can't find pictures of it built up to double check! I'd ridden it a little way without issue before this happened though, was shifting nicely and no noise.
Found one, chain routed correctly! Only thing I can imagine is the upper jockey wheel being too close to the cassette and causing the chain to jam?!?
Josē
@Glws
this looks puzzling. was the chain routed the right way into the pulleys ? not catching the little retention tab