What Is 285/75R18 In Inches?
Here are the approximate measurements in inches:
- Diameter of the tire: Approximately 34.83 inches
- Tire width: Approximately 11.22 inches
- Sidewall height: Approximately 8.4 inches (calculated as a percentage of the tire’s width, which is 65% in this case)
- Diameter of the wheel: 18 inches
The tire size 285/75R18 can be converted to inches as follows:
- The first number, 285, represents the width of the tire in millimeters.
- The second number, 75, represents the aspect ratio, which is the height of the sidewall as a percentage of the width.
- The letter R indicates that this is a radial tire.
- The last number, 18, represents the diameter of the wheel in inches.
To convert the width from millimeters to inches, we can divide it by 25.4 (since there are 25.4 millimeters in an inch):
- 285 mm ÷ 25.4 = 11.22 inches (rounded to two decimal places)
To calculate the height of the sidewall, we need to multiply the width by the aspect ratio:
- 11.22 inches × 0.75 = 8.415 inches (rounded to three decimal places)
Finally, we can calculate the total diameter of the tire by adding twice the sidewall height to the wheel diameter:
- 2 × 8.415 inches + 18 inches = 34.83 inches (rounded to two decimal places)
Therefore, a tire size of 285/75R18 has a diameter of approximately 34.83 inches.
Tire Height (Diameter) | 34.8 in | 885 mm |
Wheel Size | 18 in | 457 mm |
Sidewall Height | 8.4 in | 214 mm |
Tire Width | 11.2 in | 285 mm |
Tire Circumference | 109.4 in | 2,779 mm |
Revolutions per Mile | 579 | |
Revolutions per Kilometer | 359.8 |
Replacement Tire Sizes Of 285/75R18
When replacing a tire with a different size, it is important to choose a size that is compatible with the vehicle and the other tires on it. Here are some common replacement tire sizes that are equivalent to 285/75R18:
- 33×11.50R18: This is a common replacement size that is slightly narrower and has a slightly smaller overall diameter than the 285/75R18.
- 305/70R18: This is a wider tire that has the same overall diameter as the 285/75R18.
- 295/70R18: This is another common replacement size that is slightly wider and has a slightly smaller overall diameter than the 285/75R18.
- 275/70R18: This is a narrower tire that has a slightly smaller overall diameter than the 285/75R18.
Changing the tire size can affect the accuracy of the speedometer and odometer, as well as the handling and performance of the vehicle. It’s recommended to consult with a tire professional or refer to the vehicle manufacturer’s recommendations before making any changes to tire size.
FAQs
What Vehicles Can Use 285/75r18 Tires?
Tires in this size are commonly used on heavy-duty pickup trucks, such as the Ford F-250 and F-350, the Chevrolet Silverado 2500 and 3500, and the RAM 2500 and 3500.
What Does 285/75r18 Mean?
The numbers in the size represent the width of the tire in millimeters (285), the aspect ratio of the sidewall height to the tire’s width (75%), and the diameter of the wheel in inches (18).
What Is The Overall Diameter Of A 285/75r18 Tire?
The overall diameter of a tire in this size is approximately 34.83 inches.
What Is The Load Capacity Of A 285/75r18 Tire?
The load capacity of a tire in this size varies depending on the specific model and brand, but it typically ranges from 3,640 to 4,080 pounds per tire.
Can I Use 285/75r18 Tires In Place Of 275/70r18 Tires?
While they are not exactly the same size, 285/75R18 tires can be used as a replacement for 275/70R18 tires with only a slight change in diameter and width.
What Is The Recommended Air Pressure For 285/75R18 Tires?
The recommended air pressure for tires in this size will vary depending on the specific model and brand, as well as the vehicle’s weight and load. It’s important to consult the tire manufacturer’s recommendations and the vehicle’s owner’s manual for the correct tire pressure.
What Are Some Popular Brands That Make 285/75r18 Tires?
Some popular brands that make tires in this size include BFGoodrich, Nitto, Toyo, Cooper, and Goodyear.