Feature:
it is cnc machined by AL 7075-T6 round rod ,finished machined by diamond cutter,with diamond metal texture and good abrasion resistance index , it adopts imported 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 .

Size:12T,14T
Acrew axis:Fit for 4/5 MM roller screw axis
Body: 7075 aluminum alloy
Diameter:50mm(12T),58mm (14T)

Bearing:ceramic bearing ,stainless steel shell , more durable
Copper Bushing , Resistant
Color: red black blue gold Green

Apply for most of rear derailleur on the market

Package:
Narrow-Wide teeth Rear Derailleur pully *1 pcs
Copper Adapter * 2 pcs(4mm,5mm)