By ajb100 - 4/26/2014 8:22:11 PM
My simplistic belief is their spokes have some kind of sealed, stretchable bladder inside that expands under vacuum and stays in there
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By matthieutje65 - 5/5/2014 7:30:26 PM
wouldn't be strong enough to hold a car if they didn't use any cores or something I think
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