This product is ideal for cyclists upgrading their derailleur wheel bearings from a lower to a higher number of teeth (e.g., 11T to 12T or 12T to 13T).
Bike Rear Derailleur Pulley Wheel Guide 11T 12T 13T 14T Bearing Road Pulley Roller for 9/10/11 Derailleur Guide Wheel
Rear Derailleur Pulley Wheel Guide 11T 12T 13T 14T Bearing Road Bike Pulley Roller for 9 / 10 / 11 Low Friction Derailleur Wheel
1 Aluminum Rear Derailleur Pulley Wheel 11-14T Sealed Bearing for 9/10 / 11 Speed Bikes/Road Compatible Aluminum Bike Pulley
