Product details:

Designed to fit SRAM cranksets with removable spiders. Its proprietary design has an ovality of 10percent and a timing of 112 degrees after top dead center which provide the beneifits of an oval ring such as greater rear wheel traction without the traditional downsides of oval rings. Compatible with 12-speed SRAM Flattop chain. Elliptical rings provide smoother, more efficient pedal rotation, which means better traction. 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 rmended.