CeramicSpeed OSPW System for Shimano 9100/8000 11sElevate your cycling performance to the highest level with the CeramicSpeed Oversized Pulley Wheel (OSPW) System, meticulously engineered for Shimano Dura-Ace 9100/9150 and Ultegra 8000 SS/8050 SS/GS 11-speed transmissions. This is not just a component, it is a complete drivetrain upgrade designed for the discerning cyclist who demands maximum efficiency, speed, and a tangible competitive edge. Designed for unmatched optimization of your transmission, this CeramicSpeed pulley system improves performance and savings starts at 2.4 watts for an efficient experience.The OSPW System is the pinnacle of drivetrain optimization, developed and handcrafted in Denmark to reduce friction and unlock your true potential. By replacing your stock pulley wheels with this advanced system, you will experience a significant reduction in mechanical drag. The secret lies in the unique oversized 13-tooth upper and 19-tooth lower pulley wheel design, which lessens the chain´s articulation angle, resulting in dramatically lower friction and superior power transfer from your legs to the road. This translates into more speed for the same effort or less energy expended to maintain your pace, making it a crucial upgrade for racing, long-distance events, or any ride where performance matters.Beyond pure watt savings, the system delivers exceptionally crisp and precise shifting. The custom-molded, robust cage is engineered to maintain ideal spring tension and ensure perfect chain alignment, providing the reliability and accuracy you expect from a high-performance drivetrain. Every gear change is swift and definitive, allowing you to focus on the ride ahead. Built for longevity, the world-renowned CeramicSpeed bearings at the heart of each pulley wheel ensure lasting smoothness and durability, outperforming traditional systems ride after ride.Boxes* Complete OSPW System for Shimano 9100/8000* CeramicSpeed Oil for Pulley Wheel Bearings, 15ml dropper bottle* Custom tool for stock cage removal and OSPW System securing* Sticker SheetTechnical Specifications* Pulley Wheels: CeramicSpeed 13-tooth upper and 19-tooth lower* Bearing Options: CeramicSpeed Standard or Coated* Discipline: Road, Gravel, and Cross* Derailleur Compatibility: Shimano Dura-Ace 9100/9150/9170, Shimano Ultegra 8000 SS/8050 SS/8050 GS/8070* Cassette Compatibility: Fits cassettes up to 32-tooth for both Dura-Ace and Ultegra derailleurs* Speed: 11-speed* Spring Tension Settings: 2 spring tension settings for customized setup