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If you need to install your post mount Shimano rear brake caliper to your ISO frame mount using a 180mm rotor, look no further than the Shimano R180P/S Disc Brake Adapter. This setup includes the mounting hardware. R = Rear Brake, 180 = Rotor Size, P/S = Post Mount Caliper, ISO Frame Mount.
For Post Mount 74mm Caliper On ISO Mount 51mm Frame, Using 180mm Rotor
Includes Mounting Hardware