Shimano R203P/S Disc Brake Adapter

If you need to install your post mount Shimano rear brake caliper to your ISO frame mount using a 203mm rotor, look no further than the Shimano R203P/S Disc Brake Adapter. This setup includes the mounting hardware. R = Rear Brake, 203 = Rotor Size, P/S = Post Mount Caliper, ISO Frame Mount.