Tire speed rating
The rating system was developed as a standardized way to communicate how different tires ability to perform at high speeds in a test environment. With the exception of the letter H and sometimes Z, the closer the speed rating is to the end of the alphabet, the better the tire will perform at high speeds.
How to find your tire’s speed rating
The actual speed rating of the tires currently fitted on your vehicle are molded onto the sidewall of your tire at the very end of your tire’s size code, following the load index.
For example, in a tire size code of P225/60R16 97V, the speed rating is V. You can use the chart below to convert these ratings into the actual maximum speed your tire is rated for.
Tire speed rating chart
It is important to be aware that this rating is based on a test environment with tires that have not been subject to any damage.
| Speed symbol | Maximum speed | Vehicle type |
|---|---|---|
| L | 75 mph | Off-Road & Light Truck Tires |
| M | 81 mph | Temporary Spare Tires |
| N | 87 mph | |
| P | 93 mph | |
| O | 99 mph | Studless & Studdable Winter Tires |
| R | 106 mph | H. D. Light Truck Tires |
| S | 112 mph | Family Sedans & Vans |
| T | 118 mph | Family Sedans & Vans |
| U | 124 mph | |
| H | 130 mph | Sport Sedans & Coupes |
| V | 149 mph | Sport Sedans, Coupes & Sports Cars |
| W | 168 mph | Sport Sedans, Coupes & Sports Cars |
| Y | 186 mph | Sport Sedans, Coupes & Sports Cars |
| Z | 149 mph+ | Sports Cars, Exotic Cars |
Why is speed rating so important?
The speed rating should never be taken as the safe maximum speed of your vehicle, or as a recommendation that you should travel faster than the legal speed limit. The actual safe driving speed depends on many other factors, such as laws, weather and road conditions, and your car’s mechanical capabilities and condition. If a tire is old, worn down, underinflated or overloaded, the speed rating is no longer relevant.
Winter tires
Difference between speed rating and load index
The load index is a two or three digit number, while the speed index is a single letter at the very end of the entire size code. In the example above, the load index is 97, while the speed index is V.
Light truck tire speed rating
However, light trucks are not designed to travel as fast as passenger cars, so they often have lower speed ratings (often ranging between N and H).
How to read your tire?
You can find a more in-depth description about the tire code and other markings with details on size, safety, and performance by clicking on the hyperlink.
