As the fastest oversized pulley wheel system on the market, the CeramicSpeed Oversized Pulley Wheel System (OSPW System) has been developed to answer the increasing demand for improved drivetrain performance. The OSPW System optimises the overall efficiency of your drivetrain thanks to the extremely low friction of the CeramicSpeed Bearings and the unique design of the overall system. The CeramicSpeed Oversized Pulley Wheels System has been proven to be the fastest pulley system in the world. The OSPW X System reduces friction 35-40% over the stock pulley configuration. The lightweight custom molded carbon fiber cage ensures durability. This design allows the use of the same length chain as stock pulleys. The 14-tooth upper and 18-tooth lower pulley profiles ensure stable chain retention without added drag. The OSPW X System is developed, designed and handbuilt in Denmark - and test proven globally. Only compatible with 1X specific derailleurs. In the Box: Complete OSPW System for Shimano XT/XTR 1x12 CeramicSpeed Pulley Oil, 15 ml. Sticker Sheet The Story CeramicSpeed is one of the world’s leading suppliers of ceramic bearings. The company consists of two specialised sales channels, focusing on cycling and industrial applications. We have more than 15 years of experience in bearings applications, and we have developed close relationships with our component suppliers over the time – each of whom is the very best in their fields. The CeramicSpeed Sports channel delivers both bearings as well as ultrafast racing chains, reinforcing the company’s goal of saving watts and delivering the lowest friction available. All our bearings are handmade and our chains are optimised by hand in Denmark.