Wolf Tooth Elliptical Direct Mount Chainring - 34t, SRAM Direct Mount, Drop-Stop B, For SRAM 3-Bolt Boost Cranksets, 3mmDesigned 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. 3mm offset is designed for boost cranksets (52mm chainline) Elliptical rings provide smoother, more efficient pedal rotation, which means better traction Drop Stop chainrings