The Shimano Deore XT SM-CRM85 chainring is designed for use with Shimano's M8100 and M8130 1x cranksets. FEATURES: Special MTB gear tooth profile with Dynamic Chain Engagement+ improves chain engagement and retention SPECS: Round or Oval: Round Color: Black Chainline/Hub Compatibility: 141/148 Boost Hubs , 157 Super Boost Hubs Direct Mount Type: Direct Mount Shimano Tooth Count: 30 Ring Position/Type: Chain Retaining Single Ring Drivetrain Speeds: 12 Chainring BCD: Direct Mount