SRAM X-Sync Road Direct Mount Chainring RED/Force - 40t 12-Speed 8-Bolt Direct Mount GraySRAM X Sync Road Direct Mount Chainring for RED Force 40t 12 Speed 8 Bolt Direct Mount Gray. SRAM 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