Sram: Designed to handle whatever you can throw at it. 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.FEATURESX-Range™ gearing technology gives you more range and a smoother gear progression, so you’re always in the right gearCrisp and accurate front shiftsDUB™ bottom bracket adds durability, simplicity, and virtually universal frame compatibility SPECIFICATIONSSpeeds: 12BB Compatibility: All SRAM Road DUB BBsChainring Size: 46/33T, 48/35TCrank arm length: 160mm, 165mm, 170mm, 172.5mm, 175mmChainline: 45.0mmBB Spindle Interface: DUBChainring material: AluminumGuard: No GuardBolt Circle Diameter (BCD): 107 BCDCrank arm material: AluminumColor (Crank arm): Black