CeramicSpeed OSPW RS Pulley Wheel System for Shimano 9250/8150 - Coated Races, 3D Printed Ti Pulley, Carbon Cage, Oil Slick PVD EA Cage Assembly

Injection Molded Carbon Fiber reinforced PA cage offers new levels of strength and durability Premium 3D printed hollow titanium 13-tooth upper and 19-tooth lower pulley wheels are exceptionally light weight and incredibly durable and feature an oil slick PVD coating for added protection with great looks This OSPW System has handbuilt CeramicSpeed coated bearings installed in each pulley Grade 3 Silicon Nitride ball bearings are 400% smoother, 128% harder and 58% lighter than standard steel balls normally used in the bicycle industry 4 customizable spring tension settings for optimal setup Compatible with Shimano Road Dura-Ace R9250 and Ultegra R8150 12-speed rear derailleurs