Description Disc Brake Adaptors. Adaptors include Stainless steel mounting bolts Adapters are listed as rotor size / Caliper Fit / Bike Mount Fit / Fork or Frame Fit Example: 185mm / 51mm IS / 74mm / Fork PM Rotor size = 185mm Caliper Fit = 51mm IS Bike Mount Fit = 74mm Frame or Fork Fit = Fork Post Mount IS = 51mm International Standard, P = 74mm Post Mount, QR = Quick Release, TA = Thru Axle Includes Stainless Bolts
