Introducing...the Tweel. Hmm...I think this might be pretty old.

[ArchangelX]

Still, I wonder how they'd do in AutoX and road racing once they're fully developed? Pretty cool.

http://www.freshcreation.nl/comments.php?id=277_0_1_0_C

I know I've seen this around somewhere though...now that I think about it...is this an old technology?