285/75R18 Tire Size in Inches and Millimeters
285/75R18 tires have a diameter of 34.8" (885 mm), a tread width of 11.2" (285 mm), and a wheel diameter of 18" (457.2 mm).The sidewall of the tire is 8.4" (214 mm), and the tire's circumference is 109.3" (2778.9 mm). This means a 285/75R18 tire will make make 580 revolutions per mile, or 360 revolutions per kilometer.
| Spec | Inches | Metric |
|---|---|---|
| Diameter | 34.8" | 885 mm |
| Width | 11.2" | 285 mm |
| Wheel | 18" | 457.2 mm |
| Sidewall | 8.4" | 214 mm |
| Circum | 109.3" | 2778.9 mm |
| Revolutions | 580 per mile | 360 per km |
What Does 285/75R18 Mean?
The tire size 285/75R18 is a common size used on many trucks, SUVs, and other larger vehicles.
Here is what each part of the size designation represents:
- 285: This number represents the width of the tire in millimeters. In this case, the tire is 285 millimeters wide.
- 75: This number represents the aspect ratio of the tire, which is the height of the tire's sidewall as a percentage of its width. In this case, the sidewall height is 75% of the tire's width.
- R: This letter indicates the tire's construction type. “R” stands for radial construction, which is the most common type of tire construction today.
- 18: This number represents the diameter of the wheel that the tire is designed to fit on, in inches. In this case, the tire is designed to fit on a 18-inch wheel.
How To Convert 285/75R18 Into Inches
The 285/75R18 conversion is fairly simple. The first number in the tire size, 285, represents the width of the tire in millimeters. To convert this to inches, we divide 285 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 11.2 inches.
The second number in the tire size, 75, represents the aspect ratio or the height of the tire as a percentage of its width. To calculate the height in inches, we multiply 11.2 by 0.75, which gives us approximately 8.4 inches.
Finally, the last number in the tire size, 18, represents the diameter of the wheel rim in inches. Therefore, the tire size 285/75R18 can be expressed in inches as roughly 11.2 inches wide, 8.4 inches tall, and designed to fit a 18-inch wheel rim.
Frequently Asked Questions About 285/75R18 Tires
How tall is a 285/75R18 tire?
A 285/75R18 tire has an approximate height, also known as the overall diameter, of 34.8 inches (885 mm). This height can vary slightly depending on the brand and model of the tire, as well as the amount of air pressure in the tire.How wide is a 285/75R18 tire?
A 285/75R18 tire has a width of approximately 11.2 inches (285 millimeters). The width of the tire is the first number in the tire size designation, which in this case is “285”. It’s important to note that the actual width of the tire may vary slightly depending on the brand and model of the tire, and the width may also be affected by the amount of air pressure in the tire.Alternate 285/75R18 Replacement Tire Sizes
Upsizing your wheels or tires? Replacement tires must be within 3% of the diametor of the original tire. The following sizes fall within that range - click on any size to see detailed info about that tire and wheel combination.
| Size | Diameter | Width | Wheel |
|---|---|---|---|
| 275/25R30 | 35.4" | 900 mm | 30 mm |
| 275/55R22 | 33.9" | 861 mm | 22 mm |
| 275/65R20 | 34.1" | 866 mm | 20 mm |
| 275/80R17 | 34.3" | 872 mm | 17 mm |
| 275/80R18 | 35.3" | 897 mm | 18 mm |
| 285/55R22 | 34.4" | 873 mm | 22 mm |
| 285/65R20 | 34.6" | 878 mm | 20 mm |
| 285/75R17 | 33.9" | 860 mm | 17 mm |
| 285/75R18 | 34.8" | 885 mm | 18 mm |
| 295/25R28 | 33.8" | 859 mm | 28 mm |
| 295/45R24 | 34.5" | 876 mm | 24 mm |
| 295/55R22 | 34.8" | 883 mm | 22 mm |
| 295/60R20 | 33.9" | 862 mm | 20 mm |
| 295/65R20 | 35.1" | 892 mm | 20 mm |
| 295/70R18 | 34.3" | 871 mm | 18 mm |
| 295/75R17 | 34.4" | 874 mm | 17 mm |
| 305/35R26 | 34.4" | 874 mm | 26 mm |
| 305/45R24 | 34.8" | 884 mm | 24 mm |
| 305/50R22 | 34.1" | 865 mm | 22 mm |
| 305/55R22 | 35.2" | 895 mm | 22 mm |
| 305/60R20 | 34.4" | 874 mm | 20 mm |
| 305/70R17 | 33.9" | 860 mm | 17 mm |
| 305/70R18 | 34.8" | 885 mm | 18 mm |
| 305/75R16 | 34" | 864 mm | 16 mm |
| 315/20R30 | 35" | 888 mm | 30 mm |
| 315/40R25 | 34.9" | 887 mm | 25 mm |
| 315/45R24 | 35.2" | 894 mm | 24 mm |
| 315/50R22 | 34.4" | 875 mm | 22 mm |
| 315/60R20 | 34.9" | 886 mm | 20 mm |
| 315/70R17 | 34.4" | 874 mm | 17 mm |
| 315/70R18 | 35.4" | 899 mm | 18 mm |
| 315/75R16 | 34.6" | 878 mm | 16 mm |
| 325/45R24 | 35.5" | 902 mm | 24 mm |
| 325/50R22 | 34.8" | 885 mm | 22 mm |
| 325/60R20 | 35.4" | 898 mm | 20 mm |
| 325/65R18 | 34.6" | 879 mm | 18 mm |
| 325/70R17 | 35" | 888 mm | 17 mm |
| 335/35R26 | 35.2" | 894 mm | 26 mm |
| 335/40R24 | 34.6" | 878 mm | 24 mm |
| 335/55R20 | 34.5" | 876 mm | 20 mm |
| 335/70R16 | 34.5" | 876 mm | 16 mm |
| 345/60R18 | 34.3" | 871 mm | 18 mm |
| 355/40R24 | 35.2" | 894 mm | 24 mm |
| 355/50R20 | 34" | 864 mm | 20 mm |
| 355/70R16 | 35.6" | 904 mm | 16 mm |
| 375/40R24 | 35.8" | 910 mm | 24 mm |
| 375/45R22 | 35.3" | 897 mm | 22 mm |
| 375/60R18 | 35.7" | 907 mm | 18 mm |
| 375/65R16 | 35.2" | 894 mm | 16 mm |
| 385/35R24 | 34.6" | 880 mm | 24 mm |