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Amazon.com : JRC Components Pair of 13T Jockey Wheels for Shimano MTB 12SPEED | Ceramic Derailleur Pulley Wheel | Hybrid Ceramic Bearing | MTB Bike Rear Derailleur Pulley Wheels - Acid Green : Sports & Outdoors
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11T 13T Bicycle Pulley Jockey Wheel 7/8/9/10/11 Speed Rear Derailleur Fit For SHIMANO & SRAM Aluminum Alloy Jockey Wheel - AliExpress
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