Direct Mount 3-bolt chainring compatible with SRAM cranksets with a removable Spider. Narrow Wide tooth profiling ensures ultimate chain retention. FEATURES: 7075-T6 aluminum, aerospace grade strength Stiff 4mm plate thickness to transfer loads without flexing SPECS: Round or Oval: Round Material: Aluminum Chainline/Hub Compatibility: 135/142 MTB Hubs , 170/177 Hubs , 150/157 DH Hubs , 157 Super Boost Hubs , 141/148 Boost Hubs Direct Mount Type: Direct Mount SRAM Tooth Count: 28 Ring Position/Type: Chain Retaining Single Ring Drivetrain Speeds: 9 , 10 , 11 , 12 Offset: 3mm