Has NOTHING to do with what the consumer WANTS. Every company could make a Dh tire /rim combo that doesn't flat. But nobody wants to risk losing a race running something heavy enough to cross the line intact and fully inflated EVERY SINGLE TIME. And no one is gonna buy that tire unless it's got a motocross engine attached to it. Maxxis, Michelin, Continental, Vee, Pirelli, Tioga, Kenda...you name it. They could ALL make that tire. But you can't get GM to run it in a winner takes all race determined by .01 second. And you're not gonna sell it...