Elliptical 110 BCD Chainrings Options:Elliptical 110 BCD Chainring - 42t, 110 BCD, 5-Bolt, Drop-Stop, 10/11/12-Speed Eagle and Flattop Compatible, Black 5 cm) 64-color Gorilla glass

5 cm) 64-color Gorilla glass screen adjusts to conditions with ambient light sensor

The Planetary clutch is the control mechanism for the hub

Two-bike capacity

Compatible with SRAM rear derailleurs designed for 9 or fewer cogs

Maintenance-friendly bleeding process

Elliptical 110 BCD Chainrings Options:Elliptical 110 BCD Chainring - 42t, 110 BCD, 5-Bolt, Drop-Stop, 10/11/12-Speed Eagle and Flattop Compatible, Black 5 cm) 64-color Gorilla glassDesigned 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. The simplest way to explain the way these rings feel is having 2 teeth less in the weak part