Direct mount rings designed for use with SRAM cranks that utilize their 3-bolt mounting style. This premium 7075-T6 Aluminum Alloy chainring is equipped with the patent pending Drop-Stop asymmetrical tooth design for the best in wear life mud clearance and chain retention. 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: Drop-Stop ST 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 8-bolt interface Made from premium 7075-T6 aluminum for durability and weight savings Use of a clutch-style rear derailleur is recommended Tooth Count 28 Round or Oval Round Offset 3 Material Aluminum Color Black Direct Mount Type Direct Mount SRAM 3-Bolt