Lightweight, 30mm spindle, APS preload adjuster, and self-extractor bring the class-leading combo to your door. Crank boots included. Key Features: Lightest production crankset on market with ultra-lightweight carbon fiber crankarms, 30mm spindle,and APS adjuster.,73mm spindle,Compression molded carbon fiber arms, aluminum spindle,Spindle: Width 73mm, Diameter 30mm, Interface P3 Connect™,Q FACTOR: Mountain: 172mm,Chainline : 73mm Spindle: Boost (52mm) chainline w/UL Chainring,73mm Spindle: Non-Boost (49mm) chainline with a -8mm Offset Chainring,. Compatibility: Chainrings: UL Chainring, and SL Chainring, Bottom Brackets: 30mm PressFit Bottom Brackets, and Threaded Bottom Brackets.