Snow Conversion kit for Dirt Bikes...

[kevinkdx]

My brother just got back from Snowmobile Expo in West Yellowstone, MT and got a chance to see one of these. He said it looked like it would do pretty damn good, in anything under a foot of snow or so. Looks like an interesting concept to me.http://snoxcycle.com/index.html

 

[adam728]

Another player in the track game....
http://www.sidewinderkits.com/index.htm

Then there's also the Kimpex ATTRAX system, but it doesn't look as cool. :D
http://www.racerxcanada.com/recent_updates/050402_Kimpex.html