Squeaky rear derailleur after new chain install
 

Rear derailleur is 10 speed Campy Record. I just replaced my chain with 10 speed KNC and masterlink. Ever since replacing the chain I'm getting loud squeaking from the rear derailleur. It seems to be one squeak per rotation when the master link goes through the pulley. I've tried take off the master link and reinstall to make sure its locked in correctly. I've applied a good amount of lube to both pulley wheels and the spring and also tried playing with the b tension and nothing makes a difference. I didnt notice any squeak before installing the new chain so I'm pretty sure it's related but not sure what to do at this point

bump...?

You haven't routed the chain over a chain guide tab on the jockey wheel cage? Happens all the time on Shimano derailleurs.

Pretty sure I didn't but I'll check. I rode 30 miles yesterday with no problem other then the annoying squeak on every rotation of my cranks

Every rotation of crank or every rotation of link?

"It seems to be one squeak per rotation when the master link goes through the pulley."
"I rode 30 miles yesterday with no problem other then the annoying squeak on every rotation of my cranks. "


These statements are contradictory. Which is correct?

The master link goes through the pulley approximately once per crank rotation. When on the stand I can see the link going into the pulley when it squeaks

Nope, it should be every other crank rotation. The crank has 52t and a typical chain is 114 links, so the chain should take two full crank rotations to come back to approximately the same place.

Fair enough. The accurate statement is it squeaks when the link goes through the pulley which I can verify on the stand

The only thing I can think of is that you didn't get enough lube on the connecting pins of the master link.

either its rubbing on something as it goes though the RD or what andr0id suggests, both should be easy enough to rule out

Are you sure the masterlink is for 10 speed..?

The KMC chains come with the link. I guess it is possible they put in the wrong one, but unlikely.

KMC chains and links are nice because they can pretty much be put on any direction and the link can go any way and it doesn't matter.

There are some master links that have a particular orientation or they don't work right.

Maybe just a bad link..?

Yep, the link is the one that came with the chain.