SRAM X-Sync Road Direct Mount Chainring for RED/Force - 38tooth - 12-Speed - 8-Bolt Direct Mount - GraySRAM X Sync Road Direct Mount Chainrings for RED and Force 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: Direct Mount