TIRE SPEED RATING HOW TO

What tire speed rating do I need on my car?

The tire is removed and inspected for damage and wear.

Once the maximum speed is reached, it is held for 20 minutes.

The tire is rotated for 10-minute intervals at increasing speeds until the maximum speed is reached.The test room is kept at a temperature between 68 and 86 degrees.The tire is mounted to a wheel and put on a machine that simulates 80% of its load index.The procedure for the ECE (Economic Commission for Europe) tire speed determines the maximum speed a tire can safely operate at for an extended time under load. The load index number is first, followed by the tire speed rating. The speed rating and load index can be found together on the sidewall of your tire, usually after the tire dimensions.

TIRE SPEED RATING HOW TO

How to read the speed rating and load index. The likelihood of exceeding the load index of a tire is much higher than the chance of going over the speed rating. It is important to pay attention to the load index of your tires, particularly on trucks or SUVs that haul heavy loads. Combing the individual load rating of all tires on a vehicle will give you the total amount of weight it can support. Tire load rating indicates the amount of weight it can safely support.

It is important to remember that tire testing is done in a controlled lab environment, and don’t factor in real-world variables like rough roads, cold weather, and wet or icy surfaces.

Typically, the higher letter used in the speed rating means the tire can sustain higher speeds and heat levels. A speed rating is not an indicator of the maximum speed a tire can go in a short burst. The speed rating indicates the highest speed a tire can operate for a sustained period while carrying a load within its load index. Load ratings are expressed as numbers between 70 and 126. The speed rating is expressed as a letter, a combination of letters, or a combination of letters and numbers. Molded into the sidewall of your tires is a series of numbers and letters indicating information like diameter, aspect ratio, tread width, and speed rating.

Tire speed rating