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annoying dura ace rear derailleur squeak/chatter(10 posts)

annoying dura ace rear derailleur squeak/chatterM_Lou
Aug 6, 2003 5:38 AM
I am getting an annoying squeak/chatter from the rear derailleur - sounds like it's coming from the pulleys. Any ideas for rectifying this? (installed a new chain about four weeks ago, but the noise has only started a few days ago)
hate to state the obvious, butJS Haiku Shop
Aug 6, 2003 5:41 AM
apply a few drops of lube/oil to the center of the pulleys while turning the cranks in a workstand or with the bike upside down. go for a ride around the block, then hold a work towel on the chain while turning it in workstand to clean off excess lube.
To J and posters below...problem with using oil on pulleys?MXL02
Aug 6, 2003 7:24 AM
I've been told, at least on Campy rear ders, that you should never use light oil on the pulleys, since the bearing are greased, and the oil will dissolve the grease, thus necessitating re-greasing...any truth to this?
Don't think so...Mike Prince
Aug 6, 2003 8:08 AM
Oil will not dissolve the grease, maybe thin it out a bit. I wouldn't use something solvent based like WD-40 that can be applied with some pressure, but I would be less concerned about oil contaminating the grease.

Anyway, for a quick fix I would squirt some lube in there and wipe the excess. Over time you may need to tear it down and grease, but 99% of folks will never do that.

Another thought - if there's grease in there I would bet the squeak is coming from somewhere else - like maybe the metal pulley dust shields rubbing against the cage or something. There's not enough load on a pulley to displace grease IMO.
re: annoying dura ace rear derailleur squeak/chatterChen2
Aug 6, 2003 6:25 AM
Also check the cable tension and cassette lock ring.
re: annoying dura ace rear derailleur squeak/chatterMike Prince
Aug 6, 2003 7:17 AM
If you are really meticulous (sp?) the pulleys on DA roll on bearings, not bushings so you can tear them down and re-lube them. Don't ask how I know about this.... :)

Also, a squeak can also come from the derailleur pivots - probably worth putting a drop of lube in each pivot point while you are back there.

Stupid question - is the chain lubed? You said a new one was installed a month ago, but has it been cleaned and lubed?

re: Wrench may be able to confirmRob11966
Aug 6, 2003 1:15 PM
I have had squeek from rear drerailleur in the past and it has always ben the pulley wheels. i have just taken them off, disassembled the dust covers and re-greased. Problem solved mostly but I have had to replace the pulley wheels when too worn on one occassion. I have had DA for just over a year now and absolutely no probs but my understanding is that the DA pulley has a sealed bearing which cannot be serviced and once you get a problem you need to replace the whole pulley wheel. As I mentioned - never had a problem so have not looked into it. Bike wrench may be able to confirm/refute this. Would be keen to know for sure myself. Pulley wheels will eventually wear out/require re-greasing and in my experience when they do they squeek hideously whilst shifting and when worn out cause the drive chain to chatter. To be honest, I would probably replace both pulley wheels if your gear is chattering.
re: they are servicable...Mike Prince
Aug 7, 2003 10:48 AM
As long as the teeth on the wheels are not badly worn, the bearing can be serviced. Not hard, but takes a little care with a razor to pry off the bearing seal, but you can clean and re-grease the Dura-Ace bearings. You need a bit of paitence but better that instead of forking out almost $30 for a new set of pulleys.

To the original poster - check also that all of the bolts are tight too - the pulley bolts are loctited (sp?) but they will have a tendency to back out if not reinstalled to the proper torque. Also, check the main mounting bolt - a loose derailleur could also cause some chatter.
Thanks for the Info Mike (NM)Rob11966
Aug 7, 2003 2:57 PM
re: they are servicable...M_Lou
Aug 8, 2003 5:29 AM

Thanks for the info - will attempt to service pulleys this weekend.