145/80r12 in inches

The tire size 145/80r12, which is equivalent to 21.1×5.7R12 in inches, has a diameter of 21.1 inches (536.8 mm), a section width of 5.7 inches (145 mm), a wheel diameter of 12 inches (305 mm).

/ 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 145/80r12 tire size is characterized by an overall diameter of 21.1 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 145/80r12 tire has a tread or section width of 5.7 inches. This dimension represents the distance between one sidewall to the other, signifying the contact area with the road surface.

Tire Circumference

The 145/80r12 tire has a circumference of 66.4 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 145/80r12 tires feature a sidewall height of 4.6 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 145/80r12 tire size completes around 954.3 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 145/80r12 tires is 12 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 145/80r12 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 145/80r12 Mean?

The term “145/80r12” refers to the size and specifications of a tire. Here’s a breakdown of what each part of the designation means:

  • 145: This number represents the width of the tire in millimeters. In this case, the tire is 145 millimeters wide from sidewall to sidewall.
  • 80: 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 40, meaning the sidewall height is 40% 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.
  • 12: 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 145/80r12 is a radial tire that is 145 millimeters wide, with a sidewall height that is 80% of the width, and it is designed to fit a 12-inch wheel.

What Is 145/80r12 In Inches?

The tire size 145/80r12 can be expressed in inches as approximately 5.7 inches wide, 4.6 inches tall in sidewall, and designed to fit a 12-inch wheel rim. The 145/80r12 also has a circumference of 66.4 inches and It completes 954.3 revolutions per mile.

145/80r12 Equivalent

The tire size 145/80r12 is equivalent with a size of 21.1×5.7r12 in inches. This correlation is pivotal for precision in tire selection and optimal vehicle performance.

How Tall Is A 145/80r12 Tire?

The height of a 145/80r12 tire, expressed through its diameter, is approximately 21.1 inches (536.8 mm). In short, A 145/80r12 tire size is 21.1 inches (536.8 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 145/80r12 Tire?

The width of a 145/80r12 tire is 5.7 inches (145 millimeters). The first number in the tire size (145) represents the tire’s nominal width in millimeters from sidewall to sidewall when mounted on a specified width wheel.

Therefore, the 145 in a 145/80r12 tire indicates that the tire is 5.7 inches (145 millimeters).

What Size Rim For 145/80r12?

The size of the rim for a 145/80r12 tire is 12 inches in diameter. In the tire size 145/80r12, the number “12” at the end indicates the diameter of the wheel (rim) in inches that the tire is designed to fit.

In most cases, 145/80r12 tire size is compatible with rim widths ranging between 3.5 to 5.0 inches.

Replacement Tire Sizes

New tires must match the original tire’s overall diameter within a 3% range. If your tire size is 145/80r12, take a look at the options provided in the table below to find suitable alternatives.

Tire SizeOverall DiameterDifference
135/80R1220.5″ (521 mm)-3%
165/50R1420.6″ (522 mm)-2.8%
175/55R1320.6″ (522 mm)-2.8%
155/70R1220.6″ (523 mm)-2.6%
155/55R1420.7″ (526 mm)-2%
165/60R1320.8″ (528 mm)-1.7%
215/40R1420.8″ (528 mm)-1.7%
125/80R1320.9″ (530 mm)-1.3%
175/50R1420.9″ (532 mm)-0.9%
155/65R1320.9″ (532 mm)-0.9%
195/45R1420.9″ (532 mm)-0.9%
225/45R1320.9″ (532 mm)-0.9%
125/70R1420.9″ (532 mm)-0.9%
185/55R1321″ (534 mm)-0.6%
255/35R1421″ (534 mm)-0.6%
255/40R1321″ (534 mm)-0.6%
145/70R1321″ (534 mm)-0.6%
225/40R1421.1″ (536 mm)-0.2%
205/50R1321.1″ (536 mm)-0.2%
165/70R1221.1″ (537 mm)0%
165/55R1421.2″ (538 mm)0.2%
205/45R1421.3″ (540 mm)0.6%
175/60R1321.3″ (540 mm)0.6%
185/50R1421.3″ (542 mm)0.9%
145/65R1421.4″ (544 mm)1.3%
195/55R1321.4″ (544 mm)1.3%
165/65R1321.4″ (544 mm)1.3%
215/50R1321.5″ (546 mm)1.7%
135/80R1321.5″ (546 mm)1.7%
155/70R1321.6″ (548 mm)2%
185/60R1321.7″ (552 mm)2.8%
155/80R1221.8″ (553 mm)3%

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