A neat lightweight direct mount retainer ring option for the hope chainset 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 ompatible with 9spd 10spd and