Carbon fiber arms with structural foam core provide excellent strength-to-weight. Tall teeth with alternating narrow and wide profiles retain chain over rough terrain."Hidden" chainring bolt threads into crank arm to enhance chainring stiffnessQ-factor is 145mmItem SpecificationsBB IncludedNoChainline/Hub Compatibility130 HubsChainline/Hub Compatibility135/142 Road Disc Hubs < 415 mm ChainstayChainring BCD110ColorBlackCrank Intended UseCyclocrossCrank Length (mm)170Defined ColorBlackDrivetrain Speeds10Drivetrain Speeds11Number of ChainringsChain Retaining SinglePedal Spindle9/16"Rings42Spindle Interface TypeSRAM/Truvativ GXP SRAM Force 1 Crankset Crankset UPC: 710845772207