Tire Speed Rating System
Tire Talk: Tire Speed Rating System
While there is no industry-wide definition of Load Range, truck tires are frequently marked with ply rating and equivalent Load Range. These markings are used to identify the load and inflation limits of that particular tire, when used in a specific type of service.
The speed rating is the maximum service speed of a passenger car tire. Light truck tires are not speed rated. Here are a list of Goodyear's passenger tire rating indicators and their mile-per-hour equivalents. This rating system applies to all tire markers.
| Rating | Maximum Speed |
|---|---|
| Q | 99 mph |
| S | 112 mph |
| T | 118 mph |
| U | 124 mph |
| H | 130 mph |
| V | 149 mph |
| W | 168 mph |
| Y | 186 mph |
| Z | Above 186 mph |
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