Hayes Post Mount Disc Brake Adapters allow you mount 74mm disc brake calipers on forks with 74mm tabs when using larger size rotors. These 2 specific adapters are for either 7 inch or 8 inch rotors. If you intend to use your 74mm style caliper with a 6 inch rotor it will mount directly to the fork without any adapter.
8 inch/200mm bracket is Hayes part number 98-15072
7 inch/180mm bracket is Hayes part number 98-18639
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Hayes Disc Brake Adapter Post Mount - Nice. - Apr 23, 2014
5 out of 5 stars
I had to buy this product since the lame Avid interface uses a single bolt for both post and caliper mount. The long bolt worked its way out and I didn't have a long one to replace it with. This setup seems much more secure, though it adds a slight amount of weight through double bolts, even if they are shorter than the Avids.