225/45R17 in Inches

Understanding the dimensions of the 225/45R17 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 225/45R17 tire to understand what these numbers represent and how they may affect your vehicle's performance.

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What is 225/45R17 in inches?

When we convert 225/45R17 to inches, it is equivalent to 25x8.9R17 tire size in the high flotation system. 225/45R17 tires have a diameter of 25" (634 mm), a tread width of 8.9" (225 mm), and can be mounted on a wheel with a diameter of 17" (432 mm). The sidewall of the tire is 4" (101 mm), and the tire's circumference is 78.5" (1991 mm). This means a 225/45R17 tire will make 807 revolutions per mile, or 502 revolutions per kilometer.

225/45R17 Section Width
8.9"
25"
225/45R17 Tire Side
Tire Circumference
78.5"
17"
4"
807 Revs/Mile
Metric Inches
Tire Diameter 634 mm 25"
Tread Width 225 mm 8.9"
Aspect Ratio 45%
Rim Diameter 432 mm 17"
Sidewall Height 101 mm 4"
Circumference 1991 mm 78.5"
Revolutions 502 per km 807 per mile

How to read 225/45R17 tire size?

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

225 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 225 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.

17 is the diameter of the wheel that the tire fits on, measured in inches. This tire would fit on a 17-inch wheel.

How to convert 225/45R17 to inches

The 225/45R17 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 225 mm by 25.4, yielding a tire width of approximately 8.9 inches. To find the sidewall height in inches, you calculate 45% of the tire width in millimeters (225 mm), convert this figure to inches as before, resulting in a sidewall height of about 4 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 (17 inches), giving you an overall tire diameter of approximately 25 inches.

So, when converted to inches, 225/45R17 tire is 8.9 inches wide, 25 inches tall, and fits 17-inch rims.

How wide is a 225/45R17 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. 225/45R17 tire has a width of 8.9 inches or 225 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: 8.9"

How tall is a 225/45R17 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. 225/45R17 tire has a diameter or height of 25 inches or 634 mm.

Tire Diameter
Tire height: 25"

225/45R17 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. 225/45R17 tire has a sidewall height of 4 inches or 101 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: 4"

What size rim fits a 225/45R17 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. 225/45R17 tire can be mounted on 17-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: 17"

225/45R17 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. 225/45R17 tire has a circumference of 78.5 inches or 1991 mm.

Tire Circumference
Tire circumference: 78.5"

How many revolutions does a 225/45R17 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. 225/45R17 tire completes 807 revolutions per mile or 502 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: 807 per mile

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