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Find new derailleur pulleys at Art’s Cyclery: https://www.artscyclery.com/searchresults.html?search=products&searchtext=derailleur+pulley
Freshen up your rear derailleur by servicing one of the most neglected parts on your bike, the humble derailleur pulleys. Just a few minutes, some grease, and some thread locker will save you lost wattage and improve shifting performance.