Originally Posted by
seamuis
yea, buy a new chain. If your chain is that worn, it’s the most likely cause of the noise as the chain rollers aren’t seating properly between the cog teeth.
Got a KMC Z410 laying around. Got the cog cleaned up a bit, and it runs nice now. I'll probably swap the chain this weekend, and maybe the lockring too. It is made of soft metal, and three notches deformed a bit when I removed it and re-installed it.
Dave