SRAM RED Aero Chainring Direct Mount X SYNC 1x12 speed E1 BIKE24 SRAM RED AERO Crankset 1x12 speed DUB E1 50 Teeth BIKE24 Amazon.com : SRAM RED 1 Crankset 165mm, 12 Speed, 50t Aero Chainring SRAM Red 1 Crankset 12 Speed 170mm 46T 107mm BCD The Pro's Closet. Experience the pinnacle of cycling performance with the SRAM RED 1 Crankset. Crafted for those who demand excellence, this crankset combines lightweight construction with advanced aerodynamics, making it an essential upgrade for serious cyclists. Single ring drivetrain simplifies functionality and reduces weight. Direct mount aero chainrings enhance aerodynamics for improved efficiency. X Sync wide tooth narrow tooth technology ensures maximum chain control. Ultra light hollow carbon fiber crankarms are 29g lighter than previous models. Compatible with power meter upgrades for enhanced performance tracking. This crankset is ideal for competitive cyclists and cyclocross enthusiasts looking to optimize their ride. Its lightweight design and aerodynamic features make it perfect for achieving peak performance on the road or trail. Details: Crank Length: 165mm Drivetrain Speeds: 12 Color: Natural Carbon Spindle Interface: SRAM DUB Pedal Spindle: 9 16"