Ever looked at your lawn mower tires and noticed these three letters - NHS? NHS is an acronym that indicates ‘Not for Highway Service’, which specifies that the tire is not permitted for usage at high speeds or on the highway. Tires stamped with NHS are typically acceptable for usage at speeds up to 20mph. Next time you are checking your sizing do not be alarmed by these three letters. They are a safety reminder that your lawn mower tires are not for highway use. If you still need some lawn mower tires for the season don’t forget to checkout our selection of lawn mower tires.