4wd competition wheels do this also ...........run a special type of tube inside of a tubeless tyre so to run low presure for more traction.
The tube supports the bead from rolling off the rim
off fb
http://www.pinkbike.com/video/308875/
http://www.facebook.com/photo.php?fbid=512473528814966&set=a.270707839658204.66310.181680601894262&type=1&theater
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