I am using a 180mm Alligator Disc with a Hayes adapter on my Juicy 5's. I had to file away a little material on the adapter (I wanted to still used the cps washers) but it took all of 5-10 min to get it up to speed.
Try it and find out for yourself...using a 180mm Hayes adapter with an Avid caliper does not immediately work on a 180mm rotor. You have to file some material away from the adapter to get the caliper down so the pads contact entirely on the braking track. I don't know with the Formula adapter.
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