Well, my idea is to saw off the pedals, install a sprocket on the left side of the pedals (that side usually unscrews w/ a 3-piece crank), then you would have, depending on the bike, 5-27 speeds. If I did this with my current bike I would have 27 speeds! . I am going to buy another bike eventually and try this idea out. Anyone see any problems with it (in my mind I am picturing the sprocket actually spinning the right way. it will right?)