Adventurer Doug Stoup, wanting to find a faster alternative on ice than skis, has come up with the ice bike. In 2000, the adventurer was the first American to ski from the Antarctic coast to the South Pole. But he found the going a bit slow. Working with bike designer and aerospace engineer, Dan Hanebrink, he came up with a faster alternative than skies - the ice bike that he can ride in Antarctica....
The bike has no plastic parts because they would freeze and shatter in the extreme conditions. And it has superfat, low-pressure tires that provide traction in situations that no mountain bike could cope with.
http://bluecollarmtb.com/2006/07/18/the-ice-bike/