CeramicSpeed's gravel-specific OSPW X system for SRAM’s 13-speed AXS XPLR E1 comes equipped with 14-tooth and 20-tooth Alpha Disc Pulley Wheels. Their composite teeth material offers prolonged wear protection and noise reduction - while the solid aluminum discs eliminate the potential of external objects getting stuck. Nestled in the Alpha Disc pulleys is their patent-pending Active Debris Remover (ADR) bearing protective tech feature. ADR combines a stainless-steel dust cover and a surrounding bladed groove structure that pushes contaminants away from the bearing when rotating. The pinnacle of efficiency and protection when paired with their hand-built hybrid ceramic bearings. The new OSPW X for SRAM RED, Force, and Rival XPLR AXS comes with a reinforced molded carbon fiber cage to achieve strength, durability, and minimal weight.