The Easton direct mount CINCH chainring for Flattop chains has an updated tooth profile optimized for SRAM Flattop 12-speed chains.
The CINCH direct mount system provides weight savings and makes swapping chainrings fast and simple Optimized for 12-speed Flattop chains Directional tooth design provides exceptional chain retention Variable tooth width Crafted from EA90 Aluminum 47mm chainline Compatible, but not optimized for, 11-speed chains 38t, 12-Speed Round or Oval: Round Color: Black Chainline/Hub Compatibility: 130 Hubs , 135/142 Road Disc Hubs < 415 mm Chainstay , 135/142 Road Disc Hubs > 415 mm Chainstay Direct Mount Type: Direct Mount CINCH Material: Alloy Tooth Count: 38 Drivetrain Speeds: 12 Defined Color: Black 36t, 12-Speed Round or Oval: Round Color: Black Chainline/Hub Compatibility: 130 Hubs , 135/142 Road Disc Hubs < 415 mm Chainstay , 135/142 Road Disc Hubs > 415 mm Chainstay Direct Mount Type: Direct Mount CINCH Material: Alloy Tooth Count: 36 Drivetrain Speeds: 12 Defined Color: Black 44t, 12-Speed Round or Oval: Round Color: Black Chainline/Hub Compatibility: 130 Hubs , 135/142 Road Disc Hubs < 415 mm Chainstay , 135/142 Road Disc Hubs > 415 mm Chainstay Direct Mount Type: Direct Mount CINCH Material: Alloy Tooth Count: 44 Drivetrain Speeds: 12 Defined Color: Black 42t, 12-Speed Round or Oval: Round Color: Black Chainline/Hub Compatibility: 130 Hubs , 135/142 Road Disc Hubs < 415 mm Chainstay , 135/142 Road Disc Hubs > 415 mm Chainstay Direct Mount Type: Direct Mount CINCH Material: Alloy Tooth Count: 42 Drivetrain Speeds: 12 Defined Color: Black 40t, 12-Speed Round or Oval: Round Color: Black Chainline/Hub Compatibility: 130 Hubs , 135/142 Road Disc Hubs < 415 mm Chainstay , 135/142 Road Disc Hubs > 415 mm Chainstay Direct Mount Type: Direct Mount CINCH Material: Alloy Tooth Count: 40 Drivetrain Speeds: 12 Defined Color: Black The individual tooth profile has moved from the traditional symmetrical shape to more directional specific design with the intention to create a positive chain roller engagement to help with chain retention, critical to prevent chain slip and bounce over rough terrain. Easton Direct Mount CINCH Chainring - 12-Speed / For Flattop Chains, Black.They use a narrow/wide design specifically tailored to road/cx/gravel applications.