Our latest gravel-specific OSPW X system for SRAM's 13s 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 our 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 our hand-built hybrid ceramic bearings. The new OSPW X for SRAM Red XPLR AXS comes with a reinforced molded carbon fiber cage to achieve strength, durability, and minimal weight.Features:- ALPHA Disc pulleys for exceptional durability and longevity- Patent pending ADR bearing protection that keeps the bearings clean and spinning free- Handbuilt bearings for maximum effeciency and lifetimeSpecifications:- Gross Weight: 291 g- Pulley Material: AluminiumIn the box:- Complete OSPW X ALPHA for SRAM XPLR E1 system