You can always purchase a DOT approved tire like the Kenda K760 Trackmaster and then sell the tires currently on the bike to recoup some of the cost. Or keep them, wear out, one set, then have the other set on hand for later. The K760 is at least an aggressive tire for off road riding and would be about $100 for the set.
It's kind of annoying having to spend an extra hundred bucks on tires just to register it, but it's about the only option for a bike that comes with competition tires.
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