The Speed Index of Tires

What is the Speed Index of Tires?

The speed index of a tire is a letter that indicates the maximum speed at which the tire is safe to operate. The speed index is determined by the tire's construction and materials, and it is typically found on the sidewall of the tire.

The speed index is important because it helps to ensure that the tire will not fail at high speeds. Tires that are not rated for the speeds at which they are being driven can overheat and fail, which can lead to a loss of control and an accident.

How to Choose the Right Speed Index for Your Tires

When choosing the right speed index for your tires, you need to consider the following factors:

• The maximum speed at which you will be driving
• The type of driving you will be doing
• The climate in which you live

If you will be driving at high speeds, you will need to choose a tire with a high speed index. If you will be doing a lot of driving in hot weather, you will need to choose a tire with a heat-resistant compound.

Speed Index Ratings

The following table shows the speed index ratings for tires:

| Speed Index | Maximum Speed (mph) | |---|---| | N | 87 | | P | 93 | | Q | 99 | | R | 106 | | S | 112 | | T | 118 | | U | 124 | | H | 130 | | V | 149 | | W | 168 | | Y | 186 | | ZR | over 186 |

Conclusion

The speed index of a tire is an important safety feature that should be considered when choosing new tires. By choosing the right speed index for your tires, you can help to ensure that you and your passengers stay safe on the road.

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