Hayes calipers use 74mm spacing for mounting purposes. If you have a quick release fork that has IS tabs (A.K.A. 51mm tabs) and you want to use a Hayes caliper, this is the mounting bracket you would need. It is available in 3 sizes that correspond to the size of the rotor being used.
6" (160mm) Part # 98-15068 (Also works as Rear 140mm Adapter)
7" (180mm) Part # 98-18640
8" (203mm) Part # 98-15604
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