Wolf Tooth Elliptical Direct Mount Chainring - 30t SRAM Direct Mount Drop-Stop For SRAM BB30 Short Spindle Cranksets 0mm Offset Black. Designed to fit SRAM cranksets with removable spiders. Its proprietary design has an ovality of 10% 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.

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 recommended