Ceramic Speed OSPW X for Shimano GRX 2x12The ultimate drivetrain upgrade The Ceramic Speed OSPW (Over-Sized Pulley Wheel) X system is purpose-built for the demanding gravel rider, designed to increase drivetrain performance and add an element of customization to your high-tech drivetrain. The OSPW X is engineered specifically for gravel and cross, for performance gains on the toughest gravel races and cyclocross courses. This OSPW X is designed for Shimano GRX 2x12 rear derailleurs and features lightweight, durable aluminum pulley wheels with a classic 5-spoke design to reduce weight, with handbuilt Ceramic Speed bearings for ultra-low rolling resistance. The molded carbon fiber cage offers rugged durability, precise shifting, and a lightweight design, while the customizable spring tension of the OSPW X allows riders to achieve the optimal drivetrain setup, no matter where they ride. Features Reduces drivetrain friction by 35-40% compared to stock derailleur configuration Designed specifically for gravel or cyclocross to hold up to the unique demands of challenging conditions Lightweight custom-molded carbon fiber cage balances weight, rigidity, and durability for exceptional performance5-spoke alloy pulley wheels for low-weight performance Coated bearing options for unbeatable corrosion resistance Lifetime warranty for coated bearing configurations through Ceramic Speed for added peace-of-mind Customizable spring tension for an optimal drivetrain setup Specifications Net Weight70 grams Pulley Material Aluminium Derailleur Compatibility Shimano RD-RX820, RD-RX825 rear derailleurs Manufacturer Item Number(s)113777 (Black)Included in Box Complete OSPW X system, Pulley Wheel Oil (15ml) | Ceramicspeed | Ceramic Speed Ospw X For Shimano Grx 2X12 Black