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16T Bike Ceramic Bearing Jockey Pulley Wheel Set Carbon Fiber Rear Derailleurs Guide Replacement for Shimano 68006870460090009070 UltegraDURA - Walmart.com
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Shimano Sora Rear derailleur upgrades pulley wheels to 11T-14T ceramic bearing, folding bike DIY - YouTube
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When to replace your jockey wheels - avoid an expensive mechanical issue and improve your shifting | road.cc
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