Glossary
Speed rating
A code indicating the maximum speed at which a tire is designed to carry its rated load over an extended period. Commercial truck speed symbols: L = 75 mph, M = 81 mph, N = 87 mph. Appears as part of the service description.
Verify that the tire's speed rating is appropriate for the application. Some specialty or retreaded tires carry speed restrictions that limit their use on high-speed highway routes.
Real-World Use
A long-haul fleet buying trailer tires checks the speed rating to confirm it covers sustained interstate operation, especially for any tire with a non-standard designation.
What to Pair It With
Read this term with the full tire sidewall, vehicle rating information, manufacturer documentation, and the actual condition of the tire.
This site is for general information only. It does not replace professional tire service, DOT compliance advice, tire manufacturer instructions, vehicle manufacturer recommendations, or fleet policy.