OSPW X for Shimano GRX810/815 + RX800/805 Cerakote Limited Edition,This 13-tooth upper and 19-tooth lower OSPW System has been platform proven at races like Paris Robaix, Strada Bianche and CX World Cups. The system is built for gravel and cross disciplines and meets the needs for durability, low friction and longevity. The four spring tension settings allow customised setup based on ride conditions, and the handbuilt OSPW System offers custom molded carbon fiber cage for lightweight and durability. Unique ceramic coated pulley wheels comes in a Pink and White Cerakoted version. CeramicSpeed OSPW Systems reduces friction 35-40% over stock pulley configuration. Only compatible with the '2X-specific' GRX 810, GRX 815, as well as the RX800, and RX805 derailleurs. Specifications:- Pulley Wheels: Ceramic Speed 13-tooth upper and 19-tooth lower- Pulley Wheel Material: Aluminium- Cage Material: Carbon reinforced PA- Bearing Options: Ceramic Speed Coated- Ceramic Speed Grease/Oil: Ceramic Speed Oil for Pulley Wheel Bearings- Compatibility: Shimano GRX 810 & GRX 815, Shimano Ultegra RX 800 & Ultegra RX 805 - Casette Compatibility: Up to a 11-36 range- Spring Tension Settings: 4 spring tension settings- Speed: 11-speed- Discipline: Gravel/Cross In the box:- Complete OSPW X System for Shimano GRX/RX 2x11- Ceramic Speed Oil for Pulley Wheel Bearings, 15 ml. dropper bottle