Michelin has had something like that in the works for several years now, called the Tweel. They origianlly showed it on cars, but what I'm finding on their site now is geared for the construction industry. http://www.michelin.com/corporate/actualites/en/actu_affich.jsp?id=17448&codeRubrique=58〈=EN Also, do a google search for tweel, and chaeck out some of the pics.