Rear Derailleur Pulley Aluminum Alloy Replacement Parts Sealed Bearing Jockey Roller , 11T 13T... - The inner ceramic bearing is ultralight and super lubricating, which can ensures its smooth working and provide you with a great using effect. Positive and negative wheel can effectively the horizontal swing of the chain, so that the speed is more accurate The inner ceramic bearing is ultralight and super lubricating, which can ensures its smooth working and provide you with a great using effect. Positive and negative wheel can effectively the horizontal swing of the chain, so that the speed is more accurate - Easy to install, included a screw and 2 replaceable 4mm and 5mm bushing to enrich your installation choices. 11-17T Wheel MTB Ceramic Bearing Pulley Road Bike Bicycle Rear Derailleur Description: - Bike rear derailleur pulley is made of high quality ceramic bearing + aluminum alloy material, whcich rust and resistant, sturdy and . Deep toothed guide wheel to chain drop. Great quality product! Works flawlessly, in solid workmanship and intuitive service. Definitely worth the price. I recommend it to everyone The rear derailleur pulley is used on rear derailleur for chain transportation and speed changing, which is a necessary accessary for . Aluminum Alloy Guide Wheel MUQZI Bike Rear Derailleur Jockey Wheel 11T 13T Pulley Guide Roller MTB Bike Derailleur Pulley