o4KX500,
I have done a fair bit of winter riding. The easiest and cheapest is to put sheet metal screws in your knobs. For general riding, 1 screw in each front knob and for the rear 1 or 2 in the side knobs and three in the center for some straight line traction. You can use normal sheet metal screws but there are ones made for ice racing that are hardened and have a higher lip (it's the head that gives the traction) and they work so much better that it's not really worth using normal ones. To be competitive in ice racing (at least in Canada - may be different elsewhere) you have to run a certain tire that works best, profile the tire on a machine and use a special (secret) screw pattern. I'm in BC and we buy our tires pre-made from specialists in Quebec since they are the best and it shows in performance. Funnest winter riding where I live is to wait until the snowmobile trails freeze (lots of huge whoops) then blast down those. Big fun. Cam.
