The only reason I'd replace a pulley that was OK would be to use a larger idler to increase chain take up capacity on a derailleur that I was running over capacity, ie. The RD is rated for 27t of take up and my gearing needs 30.
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Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
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