135/80r12 in inches

The tire size 135/80r12, equivalent to 20.5×5.3R12, possesses a diameter of 20.5 inches, a section width of 5.3 inches, and a wheel diameter of 12 inches.

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


Overall Diameter

The 135/80r12 tire size is characterized by an overall diameter of 20.5 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 135/80r12 tire has a tread or section width of 5.3 inches. This dimension represents the distance between one sidewall to the other, signifying the contact area with the road surface.

Tire Circumference

The 135/80r12 tire has a circumference of 64.4 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 135/80r12 tires feature a sidewall height of 4.3 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 135/80r12 tire size completes around 983.6 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 135/80r12 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 135/80r12 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 135/80r12 Mean?

The term “135/80r12” refers to the size and specifications of a tire. Here’s a breakdown of what each part of the designation means:

  • 135: This number represents the width of the tire in millimeters. In this case, the tire is 135 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 80, meaning the sidewall height is 80% 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 135/80r12 is a radial tire that is 135 millimeters wide, with a sidewall height that is 80% of the width, and it is designed to fit a 12-inch wheel.

What Is 135/80r12 In Inches?

The tire size 135/80r12 can be expressed in inches as approximately 5.3 inches wide, 4.3 inches tall in sidewall, and designed to fit a 12-inch wheel rim. The 135/80r12 also has a circumference of 64.4 inches and It completes 983.6 revolutions per mile.

135/80r12 Equivalent

The tire size 135/80r12 is equivalent with a size of 20.5×5.3r12 in inches. This correlation is pivotal for precision in tire selection and optimal vehicle performance.

How Tall Is A 135/80r12 Tire?

The height of a 135/80r12 tire, expressed through its diameter, is approximately 20.5 inches (520.8 mm). In short, A 135/80r12 tire size is 20.5 inches (520.8 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 135/80r12 Tire?

The width of a 135/80r12 tire is 5.3 inches (135 millimeters). The first number in the tire size (135) represents the tire’s nominal width in millimeters from sidewall to sidewall when mounted on a specified width wheel.

Therefore, the 135 in a 135/80r12 tire indicates that the tire is 5.3 inches (135 millimeters).

What Size Rim For 135/80r12?

The size of the rim for a 135/80r12 tire is 12 inches in diameter. In the tire size 135/80r12, 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 135/80r12, take a look at the options provided in the table below to find suitable alternatives.

Tire Size Overall Diameter Difference
175/50R13 19.9″ (506 mm) -2.9%
195/45R13 19.9″ (506 mm) -2.9%
145/70R12 20″ (509 mm) -2.3%
195/40R14 20.2″ (512 mm) -1.7%
165/55R13 20.2″ (512 mm) -1.7%
115/70R14 20.4″ (518 mm) -0.6%
145/65R13 20.4″ (518 mm) -0.6%
135/70R13 20.5″ (520 mm) -0.2%
175/55R13 20.6″ (522 mm) 0.2%
165/50R14 20.6″ (522 mm) 0.2%
155/70R12 20.6″ (523 mm) 0.4%
155/55R14 20.7″ (526 mm) 1%
215/40R14 20.8″ (528 mm) 1.3%
165/60R13 20.8″ (528 mm) 1.3%
125/80R13 20.9″ (530 mm) 1.7%
195/45R14 20.9″ (532 mm) 2.1%
225/45R13 20.9″ (532 mm) 2.1%
125/70R14 20.9″ (532 mm) 2.1%
175/50R14 20.9″ (532 mm) 2.1%
155/65R13 20.9″ (532 mm) 2.1%
255/35R14 21″ (534 mm) 2.5%
145/70R13 21″ (534 mm) 2.5%
185/55R13 21″ (534 mm) 2.5%
255/40R13 21″ (534 mm) 2.5%
225/40R14 21.1″ (536 mm) 2.9%
205/50R13 21.1″ (536 mm) 2.9%

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