225/65R18 in inches

Tire size specifications, like 225/65R18, provide vital information about a tire’s dimensions and capabilities. The tire size 225/65R18 is equivalent to 29.5×8.9R18 in inches.

/ R
Tire Height
Section Width
Sidewall Height
Rim Size
Tire 1 Front View
Tire 1 Side View
Tire 1 Wheel
circumference 1


Overall Diameter

The 225/65R18 tire size is characterized by an overall diameter of 29.5 inches, measured from one edge to the other. This measurement reflects the tire’s complete height when filled to the recommended pressure.

Tread Width

The 225/65R18 tire has a tread or section width of 8.9 inches. This dimension represents the distance between one sidewall to the other, signifying the contact area with the road surface.

Tire Circumference

The 225/65R18 tire has a circumference of 92.7 inches, representing the linear distance traveled in a single revolution. This measurement is crucial for determining speed, distance, and revolutions per minute (RPM).

Sidewall Height

The 225/65R18 tires feature a sidewall height of 5.8 inches. This measurement represents the vertical distance from the outer edge of the rim to the outer edge of the tire’s tread.

It plays a crucial role in defining the tire’s profile, impacting both ride comfort and handling attributes.

Revolutions Per Mile

The 225/65R18 tire size completes around 683.3 revolutions per mile. This metric signifies the full rotations the tire makes while covering one mile.

It’s important to grasp this value, as it plays a significant role in odometer readings, speed calculations, and aspects of fuel efficiency.

Wheel Size

The appropriate rim size for 225/65R18 tires is 18 inches in diameter. This detail becomes crucial when contemplating wheel replacement or upgrade, as it guarantees proper fitting of the tire onto the rim.

Construction Type

Finally, the 225/65R18 tires utilize a radial construction. In radial tire design, the internal layers or “plies” are oriented perpendicular to the direction of travel.

This configuration enhances heat dissipation and elevates overall performance, surpassing alternative construction methods.

What Does 225/65R18 Mean?

The term “225/65R18” refers to the size and specifications of a tire. Here’s a breakdown of what each part of the designation means:

  • 225: This number represents the width of the tire in millimeters. In this case, the tire is 225 millimeters wide from sidewall to sidewall.
  • 65: This number indicates the aspect ratio, which is the ratio of the tire’s sidewall height to its width. In this example, the aspect ratio is 65, meaning the sidewall height is 65% of the tire’s width.
  • R: This letter stands for “radial,” which is the most common type of tire construction. Radial tires have ply cords that run perpendicular to the direction of travel.
  • 18: This number represents the diameter of the wheel, in inches, on which the tire is designed to fit.

So, in summary, a tire with the designation 225/65R18 is a radial tire that is 225 millimeters wide, with a sidewall height that is 65% of the width, and it is designed to fit a 18-inch wheel.

What Is 225/65R18 In Inches?

The tire size 225/65R18 can be expressed in inches as approximately 8.9 inches wide, 5.8 inches tall in sidewall, and designed to fit a 18-inch wheel rim. The 225/65R18 also has a circumference of 92.7 inches and It completes 683.3 revolutions per mile.

225/65R18 Equivalent

The tire size 225/65R18 is equivalent with a size of 29.5x8.9R18 in inches. This correlation is pivotal for precision in tire selection and optimal vehicle performance.

How Tall Is A 225/65R18 Tire?

The height of a 225/65R18 tire, expressed through its diameter, is approximately 29.5 inches (749.7 mm). In short, A 225/65R18 tire size is 29.5 inches (749.7 mm) tall.

The height of the tire is subject to slight variations, determined by both the brand and model of the tire, in addition to the amount of air pressure it holds.

How Wide Is A 225/65R18 Tire?

The width of a 225/65R18 tire is 8.9 inches (225 millimeters). The first number in the tire size (225) represents the tire’s nominal width in millimeters from sidewall to sidewall when mounted on a specified width wheel. Therefore, the 225/65R18 tire size is 8.9 inches (225 mm) wide.

What Size Rim For 225/65R18?

The size of the rim for a 225/65R18 tire is 18 inches in wheel diameter. In the tire size 225/65R18, the number “18” at the end indicates the diameter of the wheel (rim) in inches that the tire is designed to fit. The rim width range for this tire is typically 6.0-8.0″.

Replacement Tire Sizes

New tires must match the original tire’s overall diameter within a 3% range. Take a moment to inspect the options listed below before selecting a suitable tire size.

Tire SizeOverall DiameterDifference
245/55R1828.6″ (727 mm)-2.9%
225/60R1828.6″ (727 mm)-2.9%
275/40R2028.7″ (728 mm)-2.8%
245/45R2028.7″ (728 mm)-2.8%
315/35R2028.7″ (728 mm)-2.8%
245/50R1928.7″ (729 mm)-2.7%
225/55R1928.8″ (731 mm)-2.4%
275/45R1928.8″ (731 mm)-2.4%
155/80R1928.8″ (731 mm)-2.4%
305/45R1828.8″ (731 mm)-2.4%
275/50R1828.9″ (733 mm)-2.1%
315/40R1928.9″ (735 mm)-1.9%
285/40R2029″ (736 mm)-1.7%
325/35R2029″ (736 mm)-1.7%
155/90R1829″ (737 mm)-1.6%
175/80R1829″ (737 mm)-1.6%
255/55R1829″ (737 mm)-1.6%
255/45R2029.1″ (738 mm)-1.5%
285/45R1929.1″ (739 mm)-1.3%
255/50R1929.1″ (739 mm)-1.3%
235/60R1829.1″ (739 mm)-1.3%
145/80R2029.1″ (740 mm)-1.2%
235/55R1929.2″ (741 mm)-1.1%
285/50R1829.3″ (743 mm)-0.8%
235/50R2029.3″ (744 mm)-0.7%
295/40R2029.3″ (744 mm)-0.7%
265/45R2029.4″ (746 mm)-0.4%
325/45R1829.5″ (749 mm)0%
265/55R1829.5″ (749 mm)0%
265/50R1929.5″ (749 mm)0%
295/45R1929.5″ (749 mm)0%
245/60R1829.6″ (751 mm)0.3%
305/40R2029.6″ (752 mm)0.4%
245/55R1929.6″ (753 mm)0.5%
245/50R2029.7″ (754 mm)0.7%
165/90R1829.7″ (755 mm)0.8%
275/45R2029.8″ (756 mm)0.9%
275/50R1929.9″ (759 mm)1.3%
275/55R1829.9″ (759 mm)1.3%
175/80R1930″ (763 mm)1.9%
235/65R1830″ (763 mm)1.9%
255/60R1830″ (763 mm)1.9%
255/55R1930″ (763 mm)1.9%
285/45R2030.1″ (764 mm)2%
255/50R2030.1″ (764 mm)2%
235/60R1930.1″ (765 mm)2.1%
235/55R2030.2″ (766 mm)2.3%
285/55R1830.4″ (771 mm)2.9%

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