145/70r12 in inches

The tire size 145/70r12, which is equivalent to 20×5.7R12, has a diameter of 20 inches, a section width of 5.7 inches, a wheel diameter of 12 inches, and is approved to be mounted on 4.5-5.5 inches wide wheels.

/ 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 145/70r12 tire size is characterized by an overall diameter of 20 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 145/70r12 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 145/70r12 tire has a circumference of 62.8 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 145/70r12 tires feature a sidewall height of 4 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 145/70r12 tire size completes around 1008.8 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 145/70r12 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 145/70r12 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 145/70r12 Mean?

The term “145/70r12” 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.
  • 70: 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 70, meaning the sidewall height is 70% 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 145/70r12 is a radial tire that is 145 millimeters wide, with a sidewall height that is70% of the width, and it is designed to fit a 12-inch wheel.

What Is 145/70r12 In Inches?

The tire size 145/70r12 can be expressed in inches as approximately 5.7 inches wide, 4 inches tall in sidewall, and designed to fit a 12-inch wheel rim. The 145/70r12 also has a circumference of 62.8 inches and It completes 1008.8 revolutions per mile.

145/70r12 Equivalent

The tire size 145/70r12 is equivalent with a size of 20×5.7r12 in inches. This correlation is pivotal for precision in tire selection and optimal vehicle performance.

How Tall Is A 145/70r12 Tire?

The height of a 145/70r12 tire, expressed through its diameter, is approximately 20 inches (507.8mm). In short, A 145/70r12 tire size is 20 inches (507.8 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 145/70r12 Tire?

The width of a 145/70r12 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 145/70r12 tire indicates that the tire is 5.7 inches (145 millimeters).

What Size Rim For 145/70r12?

The size of the rim for a 145/70r12 tire is 12 inches in diameter. In the tire size 145/70r12, the number “12” at the end indicates the diameter of the wheel (rim) in inches that the tire is designed to fit.

Replacement Tire Sizes

New tires must match the original tire’s overall diameter within a 3% range. If your tire size is 145/70r12, take a look at the options provided in the table below to find suitable alternatives.

Tire SizeOverall DiameterDifference
105/80R1319.6″ (498 mm)-2.2%
165/60R1219.8″ (503 mm)-1.2%
105/70R1419.8″ (504 mm)-1%
145/60R1319.8″ (504 mm)-1%
125/80R1219.9″ (505 mm)-0.8%
175/50R1319.9″ (506 mm)-0.6%
195/45R1319.9″ (506 mm)-0.6%
165/55R1320.2″ (512 mm)0.6%
195/40R1420.2″ (512 mm)0.6%
145/65R1320.4″ (518 mm)1.8%
115/70R1420.4″ (518 mm)1.8%
135/70R1320.5″ (520 mm)2.2%
135/80R1220.5″ (521 mm)2.4%
165/50R1420.6″ (522 mm)2.6%
175/55R1320.6″ (522 mm)2.6%
155/70R1220.6″ (523 mm)2.8%

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