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Tire speed ratings are set by the tire manufacturers and are an indication of the tire’s maximum speed capability in ideal conditions. The tire load index rating communicates how many pounds a tire can safely carry. Put together, they make up the service description.
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The tire speed rating indicates the maximum speed at which a tire can carry its maximum load. On the sidewall of your tire (or the sticker in the driver's door, or the owner’s manual), the speed rating is defined by a letter right next to the load rating.
What is a tyre load rating and what is a tyre speed rating? Do they have to be respected when replacing tyres? Find the answers to your questions in this article.
A tyre's load index is a number that can be used to look up the maximum amount of weight that a tyre can bear at its speed rating when inflated to its maximum pressure. This number, which is usually between 75 and 100 for passenger cars, is not stated in pounds or any other unit of measurement.
17 Ιουν 2020 · Use a tire load index chart and speed rating chart to decode the numbers and letters on your tire sidewall and make the best tire choice for your car.
A tire’s speed rating, also call its speed index, tells you the maximum speed a tire can safely maintain over time while carrying its maximum load (which is specified in the tire load index). It is marked using a letter from A to Z, which you can then use to look up the maximum speed in miles per hour or kilometers per hour.
Tire speed rating is the overall durability and how well a tire can perform at maximum speeds while safely carrying the vehicle’s weight and payload. Tire load index is the tire’s capacity to carry a load under maximum air pressure. Tire manufacturers determine speed ratings by running tests on the tires with specially-designed machines.