Originally Posted by
dsbrantjr
Did you use a rule (preferred) or a chain checker to determine the condition of the chain? If the drivetrain ran quietly before and it does not do so after changing the cog it would seem logical to conclude that the cog or its interaction with the chain is the problem.
Yes, I measured the chain for wear and there was none. I also bought it off a friend and he said he rarely used it and only on the track.