Wolf Tooth Elliptical Direct Mount Chainring 38t SRAM Direct Mount 6mm Offset Drop Stop Flattop Compatible BLK ModelNumber=31072 }CushCore XC Tire Insert }CushCore XC Tire Insert 27 Designed as secondary level of security for a rear wheel Ring Position Type Chain Retaining Single Ring Tooth Count 38 Round or Oval Oval Drivetrain Speeds 9 Drivetrain Speeds 10 Drivetrain Speeds 11 Drivetrain Speeds 12 Offset 6 Chainline Hub Compatibility 135 142 MTB Hubs Chainline Hub Compatibility 150 157 DH Hubs Chainline Hub Compatibility 170 177 Hubs Material Aluminum Defined Color Black Direct Mount Type Direct Mount SRAM Use of a clutch style rear derailleur is recommended