Shimano XT SM-CRM85 ChainringThe new generation of XTDesigned to handle everything from XC to Enduro riding, Shimano's Dynamic Chain Engagement technology is a special gear-teeth profile design that provides increased chain retention and smoother pedaling. Proper chain retention reduces abrasion and overall wear, increasing the longevity of your drivetrain. TheXT SM-CRM85 Chainring features a direct mount design that is compatible with the new generation of 12-speed XT cranksets.FeaturesDirect Mount ChainringAluminum arms and steel teethDynamic Chain Engagement TechnologySize Options: 28, 30, 32, 34, 36TCompatible with: FC-M8100, FC-M8120, FC-M8130Shimano Part Number: SM-CRM85 | Shimano XT SM-CRM85 Chainring 30 Tooth