325/30R20 in Inches

Understanding the dimensions of the 325/30R20 tire size in both metric and imperial units of measurement is an essential part of tire maintenance and replacement. Let us take a closer look at every important aspect of the 325/30R20 tire to understand what these numbers represent and how they may affect your vehicle's performance.

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What is 325/30R20 in inches?

When we convert 325/30R20 to inches, it is equivalent to 27.7x12.8R20 tire size in the high flotation system. 325/30R20 tires have a diameter of 27.7" (704 mm), a tread width of 12.8" (325 mm), and can be mounted on a wheel with a diameter of 20" (508 mm). The sidewall of the tire is 3.9" (98 mm), and the tire's circumference is 87" (2211 mm). This means a 325/30R20 tire will make 728 revolutions per mile, or 452 revolutions per kilometer.

325/30R20 Section Width
12.8"
27.7"
325/30R20 Tire Side
Tire Circumference
87"
20"
3.9"
728 Revs/Mile
Metric Inches
Tire Diameter 704 mm 27.7"
Tread Width 325 mm 12.8"
Aspect Ratio 30%
Rim Diameter 508 mm 20"
Sidewall Height 98 mm 3.9"
Circumference 2211 mm 87"
Revolutions 452 per km 728 per mile

How to read 325/30R20 tire size?

Reading a tire size such as can be broken down into three main parts: tread width, aspect ratio and rim diameter.

325 is the width of the tire in millimeters from sidewall to sidewall when it's fully inflated and not under any load. In this example, the tire is 325 millimeters wide.

30 represents the height of the tire's cross-section as a percentage of its width. It means the height is 30% of the tire's width.

R denotes that tire has radial construction.

20 is the diameter of the wheel that the tire fits on, measured in inches. This tire would fit on a 20-inch wheel.

How to convert 325/30R20 to inches

The 325/30R20 conversion is very simple. There are 25.4 millimeters in an inch. All we have to do is divide tread width and sidewall height by 25.4 to convert to inches.

To convert the tire width to inches, you divide 325 mm by 25.4, yielding a tire width of approximately 12.8 inches. To find the sidewall height in inches, you calculate 30% of the tire width in millimeters (325 mm), convert this figure to inches as before, resulting in a sidewall height of about 3.9 inches. However, to understand the tire's overall diameter, you need to consider the height of two sidewalls and the diameter of the wheel it fits. Therefore, you multiply the sidewall height by 2 and add the wheel diameter (20 inches), giving you an overall tire diameter of approximately 27.7 inches.

So, when converted to inches, 325/30R20 tire is 12.8 inches wide, 27.7 inches tall, and fits 20-inch rims.

How wide is a 325/30R20 tire?

Tire width, also known as section width, is a measurement in millimeters that indicates the width of a tire from one sidewall to the other. It is the first number provided in a tire's size specifications. 325/30R20 tire has a width of 12.8 inches or 325 mm.

A greater tire width can increase the tire's contact patch with the road, potentially improving grip and handling. However, wider tires can also increase rolling resistance, which could negatively impact fuel efficiency.

Tire Width
Tread width: 12.8"

How tall is a 325/30R20 tire?

Tire height, also known as the tire's diameter or overall diameter, is the measurement from the ground to the top of the tire. It's essentially the distance from one side of the tire to the other, passing through the center, when it's correctly inflated and not under load. 325/30R20 tire has a diameter or height of 27.7 inches or 704 mm.

Tire Diameter
Tire height: 27.7"

325/30R20 Tire Sidewall Height

Tire sidewall height, also known as the tire's aspect ratio, is the measurement of the height of the tire's cross-section or the height of the tire from the rim to the tread. It is typically represented as a percentage of the tire's width. 325/30R20 tire has a sidewall height of 3.9 inches or 98 mm.

Sidewall height (also known as tire profile) can greatly affect a tire's driving characteristics. Lower profile tires (30 or 35 series) often provide better handling but can give a harsher ride, while higher profile tires (65 or 70 series) generally provide a smoother ride but with less precise handling.

Tire Sidewall Height
Sidewall height: 3.9"

What size rim fits a 325/30R20 tire?

The rim diameter refers to the diameter of the wheel on which a tire is mounted. It is the distance from one edge of the rim to the opposite edge, passing through the center of the wheel. 325/30R20 tire can be mounted on 20-inch wheels.

The rim diameter is crucial not only for fitting the tire properly but also plays a role in determining the overall performance of the vehicle, including its handling and ride quality.

Rim Diameter
Rim diameter: 20"

325/30R20 Tire Circumference

Tire circumference refers to the distance around the outer edge of a tire. It is the measurement of the entire circumference or perimeter of the tire when it is inflated and mounted on a wheel. 325/30R20 tire has a circumference of 87 inches or 2211 mm.

Tire Circumference
Tire circumference: 87"

How many revolutions does a 325/30R20 tire make?

Tire revolutions refer to the number of complete rotations a tire makes while the vehicle is in motion. It is a measure of the distance covered by the tire. 325/30R20 tire completes 728 revolutions per mile or 452 revolutions per kilometer.

Tire revolutions are often used in various calculations related to vehicle dynamics, such as determining the distance traveled, estimating fuel consumption, or calculating the speed of the vehicle based on the rotation of the tires. Tire revolutions can also be tracked or monitored by certain vehicle systems, such as the anti-lock braking system (ABS) or the vehicle's onboard computer, for various purposes.

Tire Revolutions
Tire revolutions: 728 per mile

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