A tire doesn’t have to be damaged or punctured to lose air. All tires will lose air naturally over time, so it’s recommended to check the pressure in all your tires, including the spare, at least once per month. Road conditions, weather conditions or other circumstances may warrant checking the pressure more often. Remember to always use a quality tire gauge when checking tire pressure, and don’t forget the spare! It may not have TPMS but check the pressure anyways in case you need your spare for an emergency.