Read the letter after the load index
Tire speed ratings, explained
The H in 102H is a speed-rating symbol. It describes a laboratory-rated capability under specified conditions, not a recommended driving speed.
How to read a speed-rating symbol
Find the letter after the load-index number: H in 102H. H corresponds to 130 mph (210 km/h) under the rating’s test conditions. The letters do not follow a simple alphabetical order: H sits between U and V. Use the chart below to interpret the symbol, then check the required rating for your exact vehicle.
Match the vehicle’s requirements
Use the speed rating specified for your vehicle and an appropriate replacement recommended by the vehicle or tire manufacturer. A higher symbol by itself does not establish better braking, comfort, tread life, or suitability for your driving.
A rating is not permission to drive that fast
Road conditions, load, inflation, wear, damage, and repairs affect a tire in use. Follow posted limits and drive for conditions. Discuss any proposed change in rating, including seasonal winter-tire fitments, with a qualified installer.
Your quick reference
| Symbol | Rated test speed (mph) | Rated test speed (km/h) |
|---|---|---|
| Q | 99 | 160 |
| R | 106 | 170 |
| S | 112 | 180 |
| T | 118 | 190 |
| U | 124 | 200 |
| H | 130 | 210 |
| V | 149 | 240 |
| W | 168 | 270 |
| Y | 186 | 300 |
Selected symbols only. Test ratings are not recommended or permitted road speeds.
Common questions
Is a higher speed rating automatically a better tire?
No. The rating describes a particular tested capability. It does not rank all aspects of comfort, braking, wear, or winter performance.
Where do I find the speed rating?
Look for the letter after the load-index number in the service description, such as H in 102H. Confirm the required replacement specification in the vehicle or tire manufacturer’s guidance.
What does ZR mean in a tire size?
ZR in a size identifies a high-speed category above 149 mph (240 km/h). It is not the complete speed specification. Check the service description, such as W or Y, and the manufacturer’s data for the exact tire.
Remember
Use the rating to confirm compatibility, not to choose a driving speed.
Sources & further reading
- Michelin: tire safety and speed-rated replacements ↗ (opens in a new tab)
- Michelin: speed-rating chart ↗ (opens in a new tab)
- Bridgestone: speed-rating symbols and ZR ↗ (opens in a new tab)
Use this guide to understand the terminology. Follow your vehicle’s owner’s manual, tire placard, and the tire manufacturer’s instructions for your exact application.