I had thought about doing that to my old Diamondback Topanga so I spent some time reading and asking about swaps, geometry, and all the rest. By the time I was done I had lots of info that only sort of helped and had decided not to do it. I did the math and found that for what I would have paid for the fork and a new headset(mine had busted bearrings) I could get a used older hardtail for about the same price and less E-Bay searching. But that's just me.