SRAM X-Sync Road Direct Mount Chainrings for Rival drivetrains feature a wide-tooth, narrow-tooth design to provides maximum chain control. SRAM 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. Item Specifications: Defined Color: Black, Direct Mount Type: Direct Mount SRAM, Drivetrain Speeds: 12, Material: Aluminum, Ring Position/Type: Chain Retaining Single Ring, Round or Oval: Round, Tooth Count: 42,