SRAM Force 1 Crankset - 175mm, 10/11-Speed, 42t, 110 BCD, BB30/PF30 Spindle Interface, BlackCarbon 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 stiffness Q factor is 145mm Product Specifics Drivetrain Speeds: 11 Drivetrain Speeds: 10 Rings: 42 Defined Color: Black Spindle Interface Type: BB30 PF30 Spindle Interface Type: BBright Number of Chainrings: Chain