CeramicSpeed OSPW X Pulley Wheel System for SRAM Eagle AXS - Coated Races, Alloy Pulley, Carbon Cage, BlackThe CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low friction bearings and unique overall design. Coated bearing races increase bearing service life by increasing hardness of race and reducing corrosion Only compatible with SRAM XX1 Eagle AXS and X01 Eagle AXS (electronic) Not designed for use with SRAM Eagle Mechanical CeramicSpeed products with coated bearings