Easton Replacement Chainring 50t -11 speedEaston direct mount rings use a new 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 roller engagement to help with chain retention, critical to prevent chain slip and bounce over rough terrain. Optimized for 11 speed drivetrains, though compatible with 9, 10 speed