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Clinging to rock is what this special-compound experiment was all about, and the result was beyond expectations. When the tire offers enough traction to keep crawling up hills until the front wheels come off the ground, you really don't need much more grip than that. Kevin couldn't pull a wheelie and shoot a photo at the same time, so this one only shows the TrXus hanging on sideways. That the tread remained quite intact despite some outright abuse was a really nice surprise, since not even all regular treads hold up well in rock use.