CeramicSpeed OSPW Pulley Wheel System Shimano Dura-Ace 9250/Ultegra 8150 - Coated Races 3D Printed Ti Pulley Carbon CageCeramicSpeed OSPW Pulley Wheel System for Shimano Dura Ace 9250 Ultegra 8150 Coated Races 3D Printed Ti Pulley Carbon Cage. The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low friction bearings and unique overall design. TECH SPECS Defined Color Black Defined Color Silver Drivetrain Speeds 12 Fits Brand Shimano Fits Model Dura Ace R9200 Series Fits Model Ultegra