The C-BEAR OCM Full Ceramic derailleur pulleys for the Shimano Dura-Ace R9250 12-speed rear derailleur work with ceramic ball bearings that run in ceramic grooves. They are larger than the original derailleur pulleys. In this way, you significantly increase the performance of your drivetrain.
Technical Information:
Application: Road, Triathlon & Time Trial
Teeth: 12 (upper pulley), 13 (lower pulley)
Gearing: 12-speed
Material: aluminium, ceramic
Bearings: Ceramic
Compatibility: Shimano Dura-Ace R9200 (R9250 Di2)
Note from the manufacturer: Approved for road use only.
Features:
OCM = Original Cage Max, more teeth than the original
ceramic bearings made by specialists
aluminium body, ceramic bearing races