Check out the latest episode of Dirt Bike Television (Season 2, episode #13).  We take a few Christini AWD bikes equipped with studded Trelleborg tires and run them up a black diamond ski slope in New Jersey.
to view the complete episode, click here:

http://www.dirtbiketelevision.com/episode13.html

or you can view on your TV at home on Dish Network channel 221, or Comcast on demand.