Wolf Tooth Elliptical Direct Mount Chainring - 30t SRAM Direct Mount Drop-Stop B For SRAM BB30 Short Spindle Cranks 0mm Offset BLKWolf Tooth Elliptical Direct Mount Chainring 30t SRAM Direct Mount Drop Stop B For SRAM BB30 Short Spindle Cranks 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