What is Tire Size Meaning?

Trying to determine what your tire size meaning is can be a daunting task. Here is a blog that will help take the mystery out of it.

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Tire size is the measure of a tire’s inner diameter, outer diameter, width, and sometimes tread depth. These dimensions are expressed in inches for both automobile and bicycle tires. The international standard for tire specifications is ISO 5775.

There are three common ways to express tire dimensions:
-Inch marking

The most common way to express tire dimensions in North America is alphanumeric, while in Europe and Asia, the metric system is more commonly used. Inch marking is used primarily in the United Kingdom.

What is Tire Size?

Tire size is the physical dimensions of a tire, expressed as inflated width, height, and diameter. A typical passenger car tire might be 215/60R16 95H. In this example,

-215 is the width in millimeters;
-60 is the aspect ratio, or sidewall height, as a percentage of the width;
-R indicates radial construction;
-16 is the wheel diameter in inches;
-95 is the load index, or how much weight the tire can support; and
-H is the speed rating, or how fast the tire can go.

There are a few things to know about tire size. First, bigger isn’t always better. A bigger tire might give your car a more aggressive look, but it can also throw off your speedometer and make your gas mileage suffer. Second, wider tires provide better grip in turns but may make your ride less comfortable. Wider tires also tend to be more expensive. And finally, different types of vehicles require different sizes of tires. Make sure you get the right size for your car!

How to Read Tire Size

The following will explain how to read tire size.Reading tire size is not complicated as it might seem at first sight. In fact, after going through this guide, you will be able to do it with relative ease.

There are two ways of looking at tire size. The first one involves using the metric system while the second one uses the inch numbering system. However, before we delve into that, it is worth noting that there is more than just one way of reading tire size. The dimensions provided on the side of a tire can be interpreted in multiple ways.

One way of looking at it would be by reading the overall diameter of the tire. For instance, a reading of P215/70R15 would indicate a diameter of 26.6 inches. This is because P215/70R15 is equal to 26.6 inches in overall diameter. Another way of looking at it would be by reading the width and aspect ratio of the tire. In our example, P215/70R15 would indicate a width of 8.5 inches and an aspect ratioof 70%.

What do the Numbers and Letters Mean in Tire Size?

The numbers and letters on a tire’s sidewall provide important information about the size, maturity, speed rating, load index, and type of tire. Let’s demystify this vital code.

The first number in a tire size is the diameter of the tire in inches. A standard passenger car tire is 15 inches in diameter. The second number is the width of the tire in inches. The width of a standard passenger car tire is 6.5 inches.

The third letter in a tire size indicates the type of vehicle for which the tire is designed. In this case, “P” means passenger car. Other designations include “LT” (light truck) and “T” (temporary spare).

The next two digits are the load index. The load index is a numeric code that corresponds to the maximum weight that can be carried by one tire. In this case, the code “87” means that each tire can carry 1,201 pounds at its maximum air pressure capacity under ideal conditions-a fully loaded mid-size sedan, for example.

What is Aspect Ratio in Tire Size?

The aspect ratio is the relationship of a tire’s sidewall height to its width. It’s expressed as a percentage. To calculate it, simply divide the sidewall height by the width. For example, if your tire has a sidewall height of 70 and a width of 40, the aspect ratio would be 70%.

The aspect ratio is important because it affects the tire’s diameter and the size of the contact patch. A higher aspect ratio means a taller sidewall and a smaller contact patch. A lower aspect ratio means a shorter sidewall and a larger contact patch.

What is Section Width in Tire Size?

The section width of a tire is the width, in millimeters, of the cross section of an inflated tire, excluding any protrusions. The width will be different depending on the elliptical shape of the tire when it is mounted on a wheel and inflated. The measurement is taken from the widest point of the tire’s inner sidewall to its outer sidewall where it meets the tread.

What is Wheel Diameter in Tire Size?

One of the most important aspects of a tire is its diameter – but what does wheel diameter in tire size mean?

Simply put, wheel diameter is the distance across the wheel, measured from one edge of the tire to the other. In most cases, the wheel diameter will be expressed in inches.

For example, a common tire size is P215/65R15. In this case, the “P” indicates that it is a passenger car tire, the “215” is the width of the tire in millimeters, the “65” is the height of the sidewall as a percentage of the width, and the “R” indicates that it is a radial tire. The “15” is the wheel diameter.

Whilewheel diameter may not seem like an important aspect of a tire, it can actually have a big impact on performance. For instance, a smaller diameter wheel will have less rolling resistance, which can lead to better fuel economy. Conversely, a larger diameter wheel may provide better handling or braking.

When shopping for tires, it is important to keep Wheel Diameter in mind to ensure you are getting the right size for your vehicle.

How to Find Your Tire Size

To find your tire size, look on the side of your tire where you’ll see a series of numbers. These numbers are the tire size.

The first number is the width of your tires in millimeters. The second number is the aspect ratio, which is the height of your tire’s sidewall divided by the width. The third number is the diameter of your wheel in inches. The fourth number is the load index, which is a number that corresponds to the load capacity of your tire.

Tire widths can range from 35 to 42 inches. The aspect ratio is usually between 30 and 60. The load index can range from 60 to 110.


There are a variety of tire sizes available on the market, and each one is meant for a specific type of vehicle. The size of the tire you need will depend on the make and model of your vehicle, as well as the driving conditions you typically encounter. To ensure you’re getting the right tires for your car, it’s important to understand tire size meaning.

Tire size is composed of a series of numbers and letters that indicate the portion of the tire that makes contact with the road. The first number in the series is the width, while the second number is the height. The final letter in the series indicates the diameter of the wheel that the tire is meant to be used with. With this information in mind, it’s easy to see how different tires can be used for different cars.

While understanding tire size meaning is important, it’s also necessary to know how to read a tire’s sidewall markings. These markings provide additional information about a tire, including its load capacity and speed rating. Once you know how to read all of this information, you’ll be able to purchase tires that are well-suited for your car and driving habits.