Originally Posted by
sheddle
Hey, good news, replacing the 9s chain with a 8s chain fixed the issue. Not sure why the drive chain hated the 9s chain so much, but hey.
The drivetrain was insulted and in terror of being replaced, so it threw a tantrum.
More seriously, 9-speed and above chains are often noisy on 8-speed and below drivetrains. My rule has always been to use speed-specific chains on 9 and above, and 8-speed chains on 8 and below.
--Shannon