Direct mount rings designed for SRAM cranks with removable spiders. This chainring is equipped with the patent pending Drop-Stop asymmetrical tooth design for the best in wear life, mud clearance, and chain retention. FEATURES: Drop-Stop chainrings are designed for use with 1x9, 1x10, 1x11 and 1x12 drivetrains Compatible with all 10-, 11-, and 12-speed chains, with the exception of Shimano 12-speed chains Shimano 12-speed chains require the use of Wolf Tooth's Shimano 12-speed specific chainrings If using a 9-speed drivetrain, use a 10-speed chain, which will provide a tighter fit for better chain retention Not compatible with the SRAM RED and Force AXS 8-bolt interface Made from 7075-T6 aluminum for long life Use of a clutch-style rear derailleur is recommended Compatible with 12-speed SRAM Flattop chain Not compatible with 12-speed Shimano Hyperglide + chains SPECS: Round or Oval: Round Material: Aluminum Chainline/Hub Compatibility: 135/142 MTB Hubs , 170/177 Hubs Direct Mount Type: Direct Mount SRAM Tooth Count: 42 Ring Position/Type: Chain Retaining Single Ring Drivetrain Speeds: 9 , 10 , 11 , 12 Offset: 6