50 teeth, 1-speed, DUB, without bottom bracket, 12-speed compatible, hollow carbon crank arms, X-Sync Aero direct mount aluminum chainring, 45 mm chainline Number of chainrings 1 Type Article Main color black Large chainring 50 T. Chainline 45.0 mm Crank length 172.50 mm Secondary color gray System compatibility 12-speed Bottom bracket DUB Variation Groupset The new and refined construction of the 1x RED Aero crankset has resulted in very low weight and high stiffness. It is no less than 29 grams lighter than its predecessor. The optional and most accurate power meter offers the most optimal riding experience of the aerodynamic SRAM RED 1x group. Single front chainring drivetrain simplifies functionality and reduces weight Direct mount aero chainrings Optional power meter Optimal chain control through X-range chainring Ultralight hollow carbon cranks DUB bottom bracket Sram Article number: 735220 EAN code: 710845898785 Supplier number: 00.6118.684.004 Retail packaging: Yes