SRAM X-Sync Aero Direct Mount Chainring SRAM's X-Sync Aero Road Chainrings are designed for provide maximum control when used with AXS road aero cranksets. Features X-SYNC wide-tooth narrow-tooth chainring technology provides maximum chain control Laser-etched chainring finish is more durable X-Range gearing technology gives you more range and a smoother gear progression so you're always in the right gear Improved aerodynamics for time trial and triathlon SPECIFICATIONSDrivetrain Speeds12Round or Oval Round Material Aluminum Direct Mount Type Direct Mount SRAM 8-Bolt | Sram | Red D1 X-Sync Aero Direct Mount Chainring 50T | Aluminum