Some people really hate having to put away their motorcycle for the winter, when the backcountry is covered in snow and the old two wheeler just can't travel over snow. Tim Jordan of Donnelly, Idaho had the same urge. Except he thought it would be nice to modify his two wheelers so that they could operate in snow. First he modified a bicycle. A prototype of the bicycle version is below.
Then he built a kit for converting a motorcycle to snow use. He now makes kits for converting a motorcycle to snow use, which can be seen at his site, Snoxcycle.com.
Of course, he's patent pending on the kit, and it has some special features that are improvements over other such conversions.