14T VS 12T. 1 x Derailleur Pulley. Narrow Wide Teeth Design, Prevent the horizontal swing of the chain. (2) Stainless Steel Shell& Ceramic Bearing For Axis ,More durable and resistant. Support 9/10/11/12 Speed Bike.
Road Bike Ceramic Pulley Rear Derailleur 10-17T Guide MTB Bearing Jockey Wheel
Road Bike Ceramic Pulley Rear Derailleur 12T 14T Guide MTB Bearing Jockey Wheel
EffiFish Bike Rear Derailleur Pulley,Road Bike Ceramic Bearing CNC Pulley Rear Derailleur 12T Wheel Wear And Resistance High Transmission Efficiency(12T Black)
Brrnoo Bike Ceramic Pulley Aluminium Alloy Rear Derailleur Guide Roller Part Accessory Smooth Ball Bearing Wheel 2pcs (11T)
Sram GXP Pressfit Road bike Ceramic bottom bracket
