Jockey Pulleys

schrockbike · 03-28-2013, 05:21 PM

I foolishly did not remove and clean my jockey pulleys (Acera derailleur) one at a time, and see that one has a metal sleeve inside the ring, and one does not. Both bushings seem to be the same length. The metal-sleeved one is slightly thinner. From my reading, it seems that this one is the "top" one (closest to the freewheel/cassette) that because it is thinner, it "wobbles" to make shifting easier. Do I have it right that I put the thinner one on top?

DaveM · 03-29-2013, 02:52 AM

Yes, the top pulley should be able to move side to side a tiny bit to help the pulley align under the cogs.

bobtravers · 03-29-2013, 10:09 AM

Usually, there's a "Centeron" marking on it...

nfmisso · 03-29-2013, 10:26 AM

Have you got the relevant documents from Shimano's TechDocs site?

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