Had a followup email with the officer. Although there are no laws governing tire exposure, he cautioned me on another point:
"With the way that the careless and reckless driving statutes read it is possible to write an operator who knowingly operates or has reason to believe the operation is hazardous, reckless, careless, or negligent manner by throwing debris into traffic."
This means that if your tires are sticking out and you throw shit, the officer can write you a ticket. So, be safe!
The officer has been great with his communication with me. Thumbs up to him!