Shimano SM-MA-R160D/D Disc Brake Adaptor for 160mm Rotor If you're building up a new road, cyclocross, or gravel bike with flat mount Shimano brakes and want to run 160mm rotors then you've come to the right place. Shimano's SM-MA-R160D/D disc brake adaptor allows you to run 160mm rotors on 140mm native frame mounts. Features Designed for Shimano flat mount calipers Turn a 140mm rotor compatible frame into a 160mm rotor compatible frame Mounting hardware included but additional hardware may be necessary depending on your bike | Shimano | Sm-Ma-R160D/d Disc Brake Adaptor For 160Mm Rotor Flat-Mount Caliper, Flat-Mount Frame