The RED AXS Aero E1 uses a single aerodynamic 50T ring with X-SYNC narrow-wide teeth. This natural-carbon version has hollow carbon-fiber crankarms in 167.5mm length and an eight-bolt direct-mount interface.
The listed chainline is 44.5mm and the spindle uses SRAM DUB. Select the frame-specific bottom bracket separately and check the drivetrain requirements for the 1×12 setup. The aerodynamic ring designation is not a measured speed gain for a particular bike.




