This looks like serious winter fun. What if you could ride your high-performance, lightweight dirtbike in the snow? Imagine throwing huge snowy rooster tails, wheelieing across snow-covered fields, carving corners through the powder and cranking your bike down to elbow-dragging lean angles - all the while knowing that if you overcook it, you'll fall into a nice soft pile of the white fluffy stuff. The US$4250 2moto snowbike kit is a bolt-on mod that takes about 2 hours to fit to a range of common dirtbikes. In place of the front wheel, you get a tough, flexible ski on the end of your forks. At the rear end, you swap your swingarm, wheel and suspension out for a thin paddle track drive unit - and voila! You've got half a snowmobile, except it leans over in the turns and looks like a helluva lot more fun.