12T Aluminum Alloy Bicycle Rear Derailleur Pulley Ceramic Bearing Jockey Wheel,Derailleur Pulley Ceramic Bearing Jockey Wheel 12T Aluminum Alloy Bicycle Rear, so that the speed is more accurate,Specifications: 12T, Apply for most rear derailleur of 12 teeth in the market, Positive and negative tooth guide wheel can effectively inhibit the horizontal swing of the chain.Bearing Jockey Wheel 12T Aluminum Alloy Bicycle Rear Derailleur Pulley Ceramic.

12T Aluminum Alloy Bicycle Rear Derailleur Pulley Ceramic Bearing Jockey Wheel

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12T Aluminum Alloy Bicycle Rear Derailleur Pulley Ceramic Bearing Jockey Wheel
so that the speed is more accurate,Specifications: 12T, Apply for most rear derailleur of 12 teeth in the market, Positive and negative tooth guide wheel can effectively inhibit the horizontal swing of the chain.