Key features direct mount retainer ring designed specificlly for our chainset saves weight without need for a seperate spider able to run a broader range of smaller chainring sizes 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 hard anodised finish makes them ultra