SRAM Rival D1 Direct Mount ChainringSRAM 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 Round or Oval: Round Direct Mount Type: 8 Bolt Direct Mount SRAM