Wolf Tooth Elliptical Direct Mount Chainring - 28t RaceFace/Easton CINCH Direct Mount Drop-Stop B For Boost Cranks 3mm Offset BLKWolf Tooth Elliptical Direct Mount Chainring 28t RaceFace Easton CINCH Direct Mount Drop Stop B For Boost Cranks 3mm Offset Black. Designed for Race Face CINCH cranks 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. This chainring features the patent