MTB Road Bike Ceramic Pulley Rear Derailleur 12T 14T Bicycle Bearing Gear Shifter Guide Wheel for Shimano Sram GX Bike Accessory

Feature:it is machined by AL 7075-T6 round rod ,finished machined by diamond ,with diamond metal texture and good abrasion resistance index , it adopts ed Japanese steel bearing,rotating without  resistance ,it greatly decreased frictional resistance,and increased cycling efficiency, the design inreased bike derailleur shifting speed ,it causes no noice when shifting speed k and prevent bike chain falling .Specification:Product Name:  Jockey Wheel Bicycle Rear Derailleur PulleySize:12T,14TAdapt to the bike speed: 7/8/9/10/11/12 speedAcrew axis:Fit for 4/5/MM roller screw axisBody:    7075 aluminum alloyDiameter:50mm(12T),58mm  (14T)Bearing:ceramic bearing ,stainle steel shell , more durableCopper Bushing , ResistantColor:  red blablue gold  GreenNet Weight: approx 12/15gApply for most of rear derailleur on the marketPackage:Narrow-Wide teeth Rear Derailleur pully *1 pcsCopper Adapter *1 pcs

1>Stainle Steel Shell ,more durable , compared with nylon shell ,  nylon shell is easy to break after 100 miles travel

2>Narrow Wide Teeth Design, Prevent the horizontal swing of the chain

3>Copper Bushing ,High Hardne ,Improve Life Time