Easton Direct Mount CINCH Chainring - 36t 12-Speed For Flattop Chains BlackEaston Direct Mount CINCH Chainring 36t 12 Speed For Flattop Chains Black. The Easton direct mount CINCH chainring for Flattop chains has an updated tooth profile optimized for SRAM Flattop 12 speed chains. They use a narrow wide design specifically tailored to road cx gravel applications. The individual tooth profile has moved from the traditional symmetrical shape to more directional specific design with the intention to create a positive chain