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Old 03-10-14, 06:00 AM
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The design of RD pulleys is calculated to minimise the lube being washed out of them, so just spraying them with some crap is more likely to just make a mess, I reckon.

Overhauling them is pretty simple. Derail the chain off the chainring, and just undo the bolts retaining the pulleys.

Unless you have fancy BB ones (which you obviously don't), there are four parts - a dustcap/thrust bearing each side of a metal bush through the plastic pulley. On Shimano derailers (and some others) the upper pulley has a metal sleeve in it and the pulley is slighty narrower than the bush to allow some slight lateral movement.

Clean, grease or oil, and reassemble.
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