Machined surfaces allow for better caliper alignment and a more rigid brake setup.
North Shore Billet Disc Brake Adaptors are CNC machined from 6061 T6511 aluminum. North Shore Billet Disc Brake Adaptors The Post Mount standard is universal to the front and rear brakes Mounting bolts are sold separately North Shore Billet Brake Adaptor - +17mm, 203 Post Mount to 220mm Rotor, Black Brake Caliper Type: Post Mount Mount | Rotor Size: 203 Post | 220 Rotor North Shore Billet Brake Adaptor - +20mm, 180mm Post Mount to 200mm Rotor, Black Brake Caliper Type: Post Mount Mount | Rotor Size: 180 Post | 200 Rotor North Shore Billet Brake Adaptor - +43mm, 160mm Post Mount to 203mm Rotor, Black Brake Caliper Type: Post Mount Mount | Rotor Size: 160 Post | 203 Rotor North Shore Billet Brake Adaptor - +40mm, 160mm Post Mount to 200mm Rotor, Black Brake Caliper Type: Post Mount Mount | Rotor Size: 160 Post | 200 Rotor North Shore Billet Brake Adaptor - +23mm, 180 Post Mount to 203mm Rotor, Black Brake Caliper Type: Post Mount Mount | Rotor Size: 180 Post | 203 Rotor.