# How are Tires Size Measured

It’s important to know how your tires are sized in order to ensure that you’re driving on the correct size for your vehicle. Tires are measured in both width and height, and the measurements are typically given in inches. The width is the measurement from one sidewall of the tire to the other, and the height is the measurement from the top of the tire tread to the bottom of the tire bead.

There are a few different ways that tires can be sized. The most common way to size tires is by their width, aspect ratio, and rim diameter.
Width: The width of a tire is measured in millimeters (mm), and usually ranges from 135 to355 mm.

The wider the tire, the better grip it will have on the road.
Aspect Ratio: The aspect ratio is the ratio of the height of the tire’s sidewall to its width. It’s expressed as a percentage, so a 50-series tire would have an aspect ratio of 50%.

A lower aspect ratio means a shorter sidewall and a taller tire, while a higher aspect ration means a taller sidewall and a shorter tire. In general, taller tires provide better handling, while shorter tires offer more stability.
Rim Diameter: The rim diameter is measure in inches, and is typically between 14 and 22 inches.

Larger diameter wheels provide better acceleration, while smaller wheels offer better fuel economy.

## How to Read a Tire Size & Understanding a Tire Sidewall – ABTL Auto Extras

## What Does the 265 70R17 Mean?

The 265 70R17 is a metric tire size. The first number, 265, refers to the width of the tire in millimeters. The second number, 70, is the aspect ratio.

This is the height of the sidewall as a percentage of the width. In this case, it’s 70%. That means that the sidewall height is 185 mm (265 mm x 0.70).

The R in this size designation stands for radial construction and 17 is the diameter of the wheel in inches.

## What Do the 3 Numbers Mean on Tire Size?

When you’re looking at the size of a tire, there are three numbers that indicate the width, height and diameter of the tire. These numbers are important because they tell you how big the tire is and what kind of vehicle it can be used on. The width is the first number, followed by the height and then the diameter.

For example, a tire with a size of P215/75R15 would have a width of 215 mm, a height of 75% of the width (161 mm), and a diameter of 15 inches. This particular size is commonly used on SUVs and light trucks.
The width is measured in millimeters (mm), while the height and diameter are both measured in inches.

The most common sizes for passenger vehicles are between 14 and 18 inches in diameter. Tires that are 16 or 17 inches in diameter are typically used on larger vehicles such as SUVs, vans and light trucks.
It’s important to know these numbers when shopping for tires because different sizes will fit different wheels.

You need to make sure that you get tires that are compatible with the wheels on your vehicle. Otherwise, they may not fit properly or work as well as they should.

## How Do You Read Tire Size Numbers?

When you’re looking at the sidewall of a tire, you’ll see a series of numbers and letters. These numbers and letters are the tire size. The first number is the width of the tire in millimeters.

The second number is the aspect ratio, which is the height of the sidewall as a percentage of the width. The third number is the diameter of the wheel in inches.
For example, if you see 245/40R18 97V on a tire, that means it has a width of 245 millimeters, a height that’s 40% of the width (98 millimeters), an 18-inch diameter, and can handle up to 97 volts before it starts to overheat.

## What Does R17 Mean?

The R17 code on a tire’s sidewall indicates its maximum load rating. The load rating is the amount of weight the tire can carry safely. The higher the number, the greater the load capacity.

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## Tire Size by Vehicle

When it comes to tires, there are a variety of sizes that can be used on any given vehicle. So, how do you know which size tire is right for your vehicle? Here is a quick guide to help you select the proper tire size for your car, truck or SUV.

For starters, it’s important to know that there are three main measurements that make up a tire size – width, height and diameter. The width is the measurement from one sidewall to the other and is typically expressed in millimeters (mm). The height, also known as the aspect ratio, is the measurement from the edge of the bead seat to the top of the tread and is shown as a percentage of the width.

Lastly, the diameter is measured from one side of the tire bead to the other and is expressed in inches.
Now that you understand how tire sizing works, let’s take a look at some specific examples. A common size for passenger cars would be P215/60R16 91H.

In this case:
P = denotes that this is a passenger car tire
215 = Tire width in mm

60 = Aspect ratio (60% of 215mm)

## How to Read Tire Sizes in Inches

When it comes to reading tire sizes, most people tend to think that the numbers are simply measurements of the tires’ diameters. However, there is actually a lot more information conveyed in those numbers and letters than just diameter. In order to understand what all those numbers and letters mean, you need to know how to read tire sizes in inches.

The first number in a tire size is the width of the tire’s tread in millimeters. The second number is the height of the sidewall as a percentage of the width. The third number is the diameter of the wheel’s inner rim in inches.

Finally, the letter at the end indicates the type of construction used in making the tire.
For example, consider a common passenger car tire size: 195/60R15. The first number, 195, indicates that this tire has a width of 195 millimeters.

The second number, 60, means that its sidewall height is 60% of its width (115mm). The third number, 15, tells us that this tire will fit on a wheel with a 15-inch diameter rim. And finally, R indicates that this is a Radial ply construction tire.

To sum it up: To read Tire Sizes In Inches you need to know 4 things – Width Tread (1st #), Sidewall Height (% of Width 2nd #), Wheel Diameter Rim (3rd #) & Type Construction (Letter after 3rd #).

## What is the Aspect Ratio of a Tire

The aspect ratio of a tire is the ratio of the width to the height. The higher the aspect ratio, the wider the tire.

## Conclusion

Tires are an essential part of a car, and their size is one of the most important factors to consider when purchasing new tires. Tires are sized according to their width, height, and diameter. The width is the measurement from sidewall to sidewall, and the height is the distance from the top of the tire to the bottom.

The diameter is the distance around the circumference of the tire.