275/65R18C in Inches

Understanding the dimensions of the 275/65R18C 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 275/65R18C tire to understand what these numbers represent and how they may affect your vehicle's performance.

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What is 275/65R18C in inches?

When we convert 275/65R18C to inches, it is equivalent to 32.1x10.8R18 tire size in the high flotation system. 275/65R18C tires have a diameter of 32.1" (815 mm), a tread width of 10.8" (275 mm), and can be mounted on a wheel with a diameter of 18" (457 mm). The sidewall of the tire is 7" (179 mm), and the tire's circumference is 100.8" (2559 mm). This means a 275/65R18C tire will make 629 revolutions per mile, or 391 revolutions per kilometer.

275/65R18C Section Width
10.8"
32.1"
275/65R18C Tire Side
Tire Circumference
100.8"
18"
7"
629 Revs/Mile
Metric Inches
Tire Diameter 815 mm 32.1"
Tread Width 275 mm 10.8"
Aspect Ratio 65%
Rim Diameter 457 mm 18"
Sidewall Height 179 mm 7"
Circumference 2559 mm 100.8"
Revolutions 391 per km 629 per mile

How to read 275/65R18C tire size?

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

275 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 275 millimeters wide.

65 represents the height of the tire's cross-section as a percentage of its width. It means the height is 65% of the tire's width.

R denotes that tire has radial construction.

18 is the diameter of the wheel that the tire fits on, measured in inches. This tire would fit on a 18-inch wheel.

How to convert 275/65R18C to inches

The 275/65R18C 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 275 mm by 25.4, yielding a tire width of approximately 10.8 inches. To find the sidewall height in inches, you calculate 65% of the tire width in millimeters (275 mm), convert this figure to inches as before, resulting in a sidewall height of about 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 (18 inches), giving you an overall tire diameter of approximately 32.1 inches.

So, when converted to inches, 275/65R18C tire is 10.8 inches wide, 32.1 inches tall, and fits 18-inch rims.

How wide is a 275/65R18C 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. 275/65R18C tire has a width of 10.8 inches or 275 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: 10.8"

How tall is a 275/65R18C 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. 275/65R18C tire has a diameter or height of 32.1 inches or 815 mm.

Tire Diameter
Tire height: 32.1"

275/65R18C 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. 275/65R18C tire has a sidewall height of 7 inches or 179 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: 7"

What size rim fits a 275/65R18C 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. 275/65R18C tire can be mounted on 18-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: 18"

275/65R18C 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. 275/65R18C tire has a circumference of 100.8 inches or 2559 mm.

Tire Circumference
Tire circumference: 100.8"

How many revolutions does a 275/65R18C 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. 275/65R18C tire completes 629 revolutions per mile or 391 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: 629 per mile

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