• Here it is on big big. I always size new chains using the old chain as a guide which was done using the park tool method. Over the last 2 years I’ve probably done 10,000km on this bike and fitted at least 7 chains and never had this issue before. This issue has only been happening since I fitted the last chain, I suppose there is a chance I removed one too many links (in a rush and not paying attention) but I dunno. The derailleur is super stiff to get to spring back into place. @hippy when I stripped the mech I didn’t remove any pins. I’m out and about at the mo but when I get home tonight I’ll unlink the chain and check it corresponds according to the park tool length calculator.

  • How old is the derailleur? It used to be a known issue that the return spring in Campag derailleurs would lose tension and need replacing. I’ve stopped using Campag now so don’t know if it’s still an issue.

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