Wolf Tooth Elliptical 110 BCD Chainring - 42t, 110 BCD, 5-Bolt, Drop-Stop, 10/11/12-Speed Eagle and Flattop Compatible, BlackDesigned for 110 BCD Cranksets. The proprietary design has an ovality of 10% and a timing of 112 degrees after top dead center which provide the benefits of an oval ring without the traditional downsides of oval rings. This chainring features the patent pending asymmetrical Drop Stop tooth design for the best in wear life, mud clearance, and chain retention. Product Details: Compatible with all 10 , 11 , and 12 speed chains, with the exception of