The Shimano Deore SM-CRM66 direct mount 12-speed chainring is constructed using durable steel the is sure to extend the service life. This rugged chainring features DYNAMIC CHAIN ENGAGEMENT+ special gear teeth profile that is designed for use in single-chainring configurations for XC, enduro, and trail riding to provide more chain retention and smoother pedaling - even over bumpy terrain. Durable steel construction extends service life Features DYNAMIC CHAIN ENGAGEMENT+ special gear teeth profile that is designed for use in single-chainring configurations for XC, enduro, and trail riding to provide more chain retention and smoother pedaling - even over bumpy terrain 3mm offset achieves 55mm chainline when used on the Deore FC-M6200 and FC-MT620 cranks (cranks sold separately) Item Specifications Color Black Defined Color Black Direct Mount Type Direct Mount Shimano Drivetrain Speeds 12 Material Steel Offset 3 Round or Oval Round Tooth Count 30 Shimano Deore SM-CRM66 Direct Mount Chainring Direct Mount Chainrings UPC: 192790956091