CeramicSpeed OSPW RS Pulley Wheel System for Shimano 9250/8150 - Coated Races 3D Printed Ti Pulley Carbon Cage Oil Slick PVD. CeramicSpeeds OSPW RS System for Shimano Road Dura-Ace R9250 and Ultegra R8150 has been lifted with a distinctly modern and angular design. The updated design brings balance and refinement to the OSPW System allowing it to blend seamlessly into the contemporary design trends of bikes and groupsets - making up the whole of which the OSPW RS System is part. Innovative tech features of the OSPW RS meets consumer demands for a premium ride experience. The design for the OSPW RS isnt solely a visual update. The cage itself has been reinforced to offer new levels of strength and durability. The CeramicSpeed OSPW RS System continues the tradition of providing optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design.