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Rear derailer
NB: Originally posted elsewhere on the Global Riders Network and appears via syndication.
When should you replace rear derailer jockey wheels
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When they look like Ninja stars!
See the one top of this image:
I have just ordered a new drive line and was not sure how much effect jockey wheels would make to premature wear on new parts. Your photo gives a good example of jockey wheel wear. top wheel in photo no good the one near brake pads ok.