There are no laws governing dirt bikes, they are made to be ridden offroad. If you do put a dual sport kit on a dirt bike and get a tag, then all laws pertaining to street bikes apply to you. You might check this link: http://www.txdps.state.tx.us/msb/
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Your Local DMV and Law enforcement office would be the better place to ask. That way you will not get "someone's option" of the law.