If you have an extra tire you are willing to experiment on you can drill holes in it from the inside out and put bolts through it to get traction on the snow. You will need to use threaded bolts and put nuts on the inside and outside with some thread locker on them to keep them from working loose. Then you get some duct tape and line the inside of the tire to keep the bolt heads from puncturing your tube. I know this will work, Ive seen it done.