12T Rear Derailleur Pulley Aluminum Alloy Jockey Wheel Ceramic Guide Pulley Bike Guide Roller Wheel for Road Bike, Mountain Bike, MTB, BMX

About this item Bike Guide Roller: Diameter: 2 inch / 50 mm; Teeth: 12T. Stronger compatibility with flexible rotation Lightweight and Sturdy: Made of quality aluminum alloy with fully sealed bearing for center bolt derailleurs, sturdy to use and longer life Ceramic Guide Pulley: Ceramic material can reduce drag force which can improve cycling efficiency. Ceramics bearing, super lubricating, noiseless Smooth Ride: Deep toothed guide wheel to reduce chain drop. Positive and negative tooth guide wheel can effectively inhibit the horizontal swing of the chain, so that the speed is more accurate 12T Rear Derailleur Pulley: Suitable for most rear derailleur of 12 teeth in the market and use 4 / 5 / 6 mm guide wheel screws. NOTE: Installation range needs to be greater than 2 inch / 50 mm