there's a guy who has a bike here that works on the same principal as that car - but unlike the bike above you still ride it straight, it's just that it's three pieces: the front wheel/fork/bars, the center frame assembly, and the rear wheel/frame/drivetrain. it's really awesome watching him ride it. he does all kinds of silly tricks like riding the front on the curb while riding the rear on the street going parallel the whole time.