httpv://www.youtube.com/watch?v=vA4l0wHf7CA&feature=player_embedded

The Freerider Skatecycle, designed by Alon Karpman at Brooklyn Workshop and winner of a Bronze 2010 IDEA Award:

The Freerider Skatecycle is a self propelled hubless skate capable of riding on flat ground or tackling any skatepark. The 9 Inch wheels makes it easier to overcome objects in your way and is very durable. Weighing just 7.3 lbs, it folds easily, and can even sit over your shoulder freeing up your hands when you walk. Now part of the permanent collection at the Henry Ford Museum, the Freerider Skatecycle is in stock and available for $149.95.

Tron Skatecycle belongs in the movie (Gizmodo)