When SRAM found ways to make their lightest and stiffest crank even lighter, they went for it. A new process further grams from the hollow carbon arms. Plus they're offering more crankarm lengths than ever before to ensure this crank works for you. Hollow carbon crank arms are 29g lighter than previous generation. 8-bolt interface compatible with power and non-power AXS spiders and integrated chainrings (Spiders and Chainrings sold separately). DUB bottom bracket adds durability and simplicity (Sold separately). Includes DUB Wide Spacer kit (2.5/3.0/4.5/5.5 mm). 150mm Q-factor / 47.5mm chainline. Item Specifications: Rings: Sold Separately, Number of Chainrings: No Rings, No Spider Included, Drivetrain Speeds: 12, Drivetrain Speeds: 13, Chainline/Hub Compatibility: 135/142 Road Disc Hubs <415 mm Chainstay, Chainline/Hub Compatibility: 135/142 Road Disc Hubs> 415 mm Chainstay, Color: Natural Carbon, Crank Length (mm): 172.5, Crank Intended Use: Gravel, BB Included: No, Pedal Spindle: 9/16", Spindle Interface Type: SRAM DUB, Defined Color: Carbon,