375/45R20 in Inches

Understanding the dimensions of the 375/45R20 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 375/45R20 tire to understand what these numbers represent and how they may affect your vehicle's performance.

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What is 375/45R20 in inches?

When we convert 375/45R20 to inches, it is equivalent to 33.3x14.8R20 tire size in the high flotation system. 375/45R20 tires have a diameter of 33.3" (846 mm), a tread width of 14.8" (375 mm), and can be mounted on a wheel with a diameter of 20" (508 mm). The sidewall of the tire is 6.7" (169 mm), and the tire's circumference is 104.6" (2656 mm). This means a 375/45R20 tire will make 606 revolutions per mile, or 377 revolutions per kilometer.

375/45R20 Section Width
14.8"
33.3"
375/45R20 Tire Side
Tire Circumference
104.6"
20"
6.7"
606 Revs/Mile
Metric Inches
Tire Diameter 846 mm 33.3"
Tread Width 375 mm 14.8"
Aspect Ratio 45%
Rim Diameter 508 mm 20"
Sidewall Height 169 mm 6.7"
Circumference 2656 mm 104.6"
Revolutions 377 per km 606 per mile

How to read 375/45R20 tire size?

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

375 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 375 millimeters wide.

45 represents the height of the tire's cross-section as a percentage of its width. It means the height is 45% 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 375/45R20 to inches

The 375/45R20 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 375 mm by 25.4, yielding a tire width of approximately 14.8 inches. To find the sidewall height in inches, you calculate 45% of the tire width in millimeters (375 mm), convert this figure to inches as before, resulting in a sidewall height of about 6.7 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 33.3 inches.

So, when converted to inches, 375/45R20 tire is 14.8 inches wide, 33.3 inches tall, and fits 20-inch rims.

How wide is a 375/45R20 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. 375/45R20 tire has a width of 14.8 inches or 375 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: 14.8"

How tall is a 375/45R20 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. 375/45R20 tire has a diameter or height of 33.3 inches or 846 mm.

Tire Diameter
Tire height: 33.3"

375/45R20 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. 375/45R20 tire has a sidewall height of 6.7 inches or 169 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: 6.7"

What size rim fits a 375/45R20 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. 375/45R20 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"

375/45R20 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. 375/45R20 tire has a circumference of 104.6 inches or 2656 mm.

Tire Circumference
Tire circumference: 104.6"

How many revolutions does a 375/45R20 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. 375/45R20 tire completes 606 revolutions per mile or 377 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: 606 per mile

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