I stripped the fixed side of my formula hub last year, and the nice rebuilt wheel is sitting uselessly in my front room. I got the idea of turning my current fixed bike into a road bike with a few bits I had laying around, and using the free side of the formula hub for a 5sp freewheel. Does this work? I only know about 1sp freewheels, and I've never had a freewheel bike with a thread on fw.