The Shimano Deore XT SM-CRM85 chainring is designed for use with Shimano&';s M8100 and M8130 1x cranksets. Special MTB gear tooth profile with Dynamic Chain Engagement+ improves chain engagement and retention Round or Oval: Round Chainline/Hub Compatibility: 141/148 Boost Hubs , 157 Super Boost Hubs Direct Mount Type: Direct Mount Shimano Ring Position/Type: Chain Retaining Single Ring Drivetrain Speeds: 12