Retainer ring 104pcd a narrowwide tooth configuration designed for 1x10 and 1x11 set ups without the need of a chain guide the narrowwide chainring is designed to retain the chain without the need of a chain device quieter drivetrain and less drag cnc machined 7075 t6 aluminium provides the perfect blend of lightweight and strength compatible with 9spd 10spd and 11spd set ups