Polished aluminum crankarms in a wide range of lengths and the DUB bottom bracket system mean the Rival crankset will keep spinning, no matter what. A tight and consistent 13-tooth gap between chainrings makes for accurate and dependable shifting. X-Range™ gearing technology gives you more range and a smoother gear progression, so you’re always in the right gear Crisp and accurate front shifts DUB™ bottom bracket adds durability, simplicity, and virtually universal frame compatibility SRAM Model ID: FC-RIV-D1 Attributes BCD 107 BB Inclusion No Chainline 45mm Teeth 46/33 Crank Spindle Diameter 28.99mm Interface DUB Crankset Material Aluminum Pedals Thread 9/16'' Primary Color Black Speed 12 Drivetrain Spacing Road Disc