Tire Size 285/75r18 in inches

The tire size 285/75r18, equivalent to 34.8×11.2R18 in inches, combines excellent traction, ruggedness, and a stylish appearance.

With its impressive dimensions and specifications, this tire size is an ideal choice for off-road enthusiasts and truck owners seeking reliable performance on various terrains.

285/75r18 in inches

This table provides extensive details to help you understand the breakdown of tire features and metrics more effectively.

Tire Height885 mm34.8″
Tread Width285 mm11.2″
Rim Diameter457.2 mm18″
Sidewall Height214 mm8.4″
Circumference2778.9 mm109.3″
Revolutions360 per km580 per mile

Dimension Breakdown

The tire size 285/75r18 is a common notation used to describe a specific tire’s dimensions and characteristics. Let’s break down the meaning of each component:

  • 285: This number represents the tire’s width in millimeters. In this case, the tire has a width of 285 mm.
  • 75: This number indicates the aspect ratio of the tire. It represents the sidewall height as a percentage of the tire’s width. In this case, the sidewall height is 75% of the tire’s width.
  • R: The letter “R” denotes the tire’s construction type, which is radial. Radial tires are the most common type used in modern vehicles due to their performance and durability.
  • 18: This number signifies the rim diameter in inches. In this case, the tire is designed to be mounted on an 18-inch wheel.

Therefore, the tire size 285/75r18 indicates a tire with a width of 285 mm, a sidewall height that is 75% of the width, radial construction, and compatible with an 18-inch wheel.

Replacement Tire Size
It is important to ensure that the new tires have an overall diameter within 3% of the 275/65r20 tire’s diameter.

Tire SizeOverall DiameterDifference
295/70R1834.3″ (871 mm)-1.6%
345/60R1834.3″ (871 mm)-1.6%
325/65R1834.6″ (879 mm)-0.7%
305/70R1834.8″ (885 mm)0%
275/80R1835.3″ (897 mm)1.4%
315/70R1835.4″ (899 mm)1.6%
375/60R1835.7″ (907 mm)2.5%

Overall Diameter
To begin with, the overall diameter, also referred to as the tire height, of the 285/75r18 tire is 885 mm or 34.8 inches. This measurement gives you an idea of the tire’s height when properly inflated and mounted on a rim. 

It is an important factor to consider, as the overall diameter affects the vehicle’s overall gearing and speedometer accuracy.

Tread Width
The tread width, which is the width of the tire’s contact surface with the road, is 285 mm or 11.2 inches for the 285/75r18 size. This wider tread width enhances stability and grip, especially when driving off-road or in challenging conditions.

Rim Diameter
Moving on to the rim diameter, the 285/75r18 tire is designed to fit on an 18-inch rim. The rim diameter measures 457.2 mm or 18 inches. Ensuring that the tire and rim sizes are compatible is crucial to guarantee proper installation and performance.

Sidewall Height
The sidewall height of the 285/75r18 tire is 214 mm or 8.4 inches. The sidewall height is the distance between the rim and the outer edge of the tire. 

It plays a significant role in the tire’s ability to absorb impacts and provide a comfortable ride. A taller sidewall height can contribute to a smoother driving experience, especially on uneven terrain.

Regarding the tire’s circumference, the 285/75r18 size measures approximately 2778.9 mm or 109.3 inches. The circumference is the measurement around the entire outer edge of the tire.

It is an essential factor in determining the tire’s rolling distance per revolution, directly affecting the vehicle’s speedometer readings and overall performance.

In terms of revolutions, the 285/75r18 tire completes around 360 revolutions per kilometer or 580 revolutions per mile. This measurement indicates the number of times the tire rotates over a specific distance.

It is crucial to consider revolutions per mile to maintain accurate speed readings and proper performance of the vehicle’s various systems.

Tire Construction
Regarding tire construction, the 285/75r18 tire is available in various types, including all-season, all-terrain, and mud-terrain, each designed to cater to specific driving needs and conditions.

It is important to choose the tire construction that aligns with your requirements, taking into account factors such as weather conditions, driving style, and terrain.

After analyzing the dimensions and specifications of the 285/75r18 tire, it is evident that it offers a substantial overall diameter of 34.8 inches, providing an impressive presence on the road. The wider tread width of 11.2 inches ensures excellent traction and stability, making it an ideal choice for off-road enthusiasts and those seeking enhanced performance.

Furthermore, the 285/75r18 tire’s sidewall height of 8.4 inches contributes to a comfortable and smooth driving experience, especially when encountering bumps and uneven surfaces. Its compatibility with an 18-inch rim diameter ensures easy installation on a wide range of vehicles.

The tire’s circumference of 109.3 inches indicates a balanced and consistent rolling distance, allowing for accurate speedometer readings and reliable performance. With approximately 580 revolutions per mile, this tire size ensures efficient rotation and optimal transmission of power to the ground.

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