Shimano R160D/D Disc Brake Adaptor The Shimano R160D/D Disc Brake Adaptor is for a flat mount road caliper being used on a flat mount frame using a 160mm rotor. It includes all the necessary hardware. Shimano R160D/D Disc Brake Adaptor Features Brake Caliper Type: Flat Mount Mount Rotor Size: Rear Flat 160 Rotor | Shimano R160D/D Disc Brake Adaptor 160mm Rear, Flat-Mount Caliper & Frame