275/65R18 Tire Size in Inches and Millimeters
275/65R18 tires have a diameter of 32.1" (815 mm), a tread width of 10.8" (275 mm), and a wheel diameter of 18" (457.2 mm).The sidewall of the tire is 7" (179 mm), and the tire's circumference is 100.8" (2559.1 mm). This means a 275/65R18 tire will make make 629 revolutions per mile, or 391 revolutions per kilometer.
| Spec | Inches | Metric |
|---|---|---|
| Diameter | 32.1" | 815 mm |
| Width | 10.8" | 275 mm |
| Wheel | 18" | 457.2 mm |
| Sidewall | 7" | 179 mm |
| Circum | 100.8" | 2559.1 mm |
| Revolutions | 629 per mile | 391 per km |
What Does 275/65R18 Mean?
The tire size 275/65R18 is a common size used on many trucks, SUVs, and other larger vehicles.
Here is what each part of the size designation represents:
- 275: This number represents the width of the tire in millimeters. In this case, the tire is 275 millimeters wide.
- 65: 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 65% 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 275/65R18 Into Inches
The 275/65R18 conversion is fairly simple. The first number in the tire size, 275, represents the width of the tire in millimeters. To convert this to inches, we divide 275 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 10.8 inches.
The second number in the tire size, 65, represents the aspect ratio or the height of the tire as a percentage of its width. To calculate the height in inches, we multiply 10.8 by 0.65, which gives us approximately 7 inches.
Finally, the last number in the tire size, 18, represents the diameter of the wheel rim in inches. Therefore, the tire size 275/65R18 can be expressed in inches as roughly 10.8 inches wide, 7 inches tall, and designed to fit a 18-inch wheel rim.
Frequently Asked Questions About 275/65R18 Tires
How tall is a 275/65R18 tire?
A 275/65R18 tire has an approximate height, also known as the overall diameter, of 32.1 inches (815 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 275/65R18 tire?
A 275/65R18 tire has a width of approximately 10.8 inches (275 millimeters). The width of the tire is the first number in the tire size designation, which in this case is “275”. 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 275/65R18 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 |
|---|---|---|---|
| 225/75R18 | 31.3" | 795 mm | 18 mm |
| 225/90R16 | 32" | 812 mm | 16 mm |
| 235/75R18 | 31.9" | 809 mm | 18 mm |
| 235/80R17 | 31.8" | 808 mm | 17 mm |
| 235/85R16 | 31.7" | 806 mm | 16 mm |
| 235/85R17 | 32.8" | 832 mm | 17 mm |
| 245/60R20 | 31.6" | 802 mm | 20 mm |
| 245/70R18 | 31.5" | 801 mm | 18 mm |
| 245/75R17 | 31.5" | 800 mm | 17 mm |
| 255/30R26 | 32" | 814 mm | 26 mm |
| 255/60R20 | 32" | 814 mm | 20 mm |
| 255/65R19 | 32.1" | 815 mm | 19 mm |
| 255/70R18 | 32.1" | 815 mm | 18 mm |
| 255/75R17 | 32" | 814 mm | 17 mm |
| 265/45R22 | 31.4" | 797 mm | 22 mm |
| 265/50R22 | 32.5" | 825 mm | 22 mm |
| 265/60R20 | 32.5" | 826 mm | 20 mm |
| 265/65R18 | 31.5" | 801 mm | 18 mm |
| 265/70R17 | 31.7" | 804 mm | 17 mm |
| 265/70R18 | 32.6" | 829 mm | 18 mm |
| 265/75R16 | 31.7" | 804 mm | 16 mm |
| 265/80R16 | 32.7" | 830 mm | 16 mm |
| 275/25R26 | 31.4" | 798 mm | 26 mm |
| 275/40R23 | 31.7" | 804 mm | 23 mm |
| 275/45R22 | 31.8" | 807 mm | 22 mm |
| 275/50R21 | 31.9" | 809 mm | 21 mm |
| 275/50R22 | 32.9" | 835 mm | 22 mm |
| 275/55R20 | 31.9" | 810 mm | 20 mm |
| 275/60R20 | 33" | 838 mm | 20 mm |
| 275/65R18 | 32.1" | 815 mm | 18 mm |
| 275/70R16 | 31.2" | 792 mm | 16 mm |
| 275/70R17 | 32.2" | 818 mm | 17 mm |
| 285/35R24 | 31.9" | 810 mm | 24 mm |
| 285/40R23 | 32" | 812 mm | 23 mm |
| 285/40R24 | 33" | 838 mm | 24 mm |
| 285/45R22 | 32.1" | 815 mm | 22 mm |
| 285/50R20 | 31.3" | 794 mm | 20 mm |
| 285/55R19 | 31.4" | 797 mm | 19 mm |
| 285/55R20 | 32.4" | 822 mm | 20 mm |
| 285/60R18 | 31.5" | 799 mm | 18 mm |
| 285/65R17 | 31.6" | 802 mm | 17 mm |
| 285/65R18 | 32.6" | 827 mm | 18 mm |
| 285/70R16 | 31.7" | 806 mm | 16 mm |
| 285/70R17 | 32.8" | 832 mm | 17 mm |
| 285/75R16 | 32.8" | 834 mm | 16 mm |
| 295/25R26 | 31.8" | 808 mm | 26 mm |
| 295/30R26 | 33" | 838 mm | 26 mm |
| 295/35R24 | 32.1" | 816 mm | 24 mm |
| 295/40R22 | 31.3" | 795 mm | 22 mm |
| 295/45R22 | 32.5" | 825 mm | 22 mm |
| 295/50R20 | 31.7" | 804 mm | 20 mm |
| 295/55R20 | 32.8" | 832 mm | 20 mm |
| 305/25R26 | 32" | 812 mm | 26 mm |
| 305/35R23 | 31.4" | 798 mm | 23 mm |
| 305/35R24 | 32.4" | 824 mm | 24 mm |
| 305/40R22 | 31.6" | 803 mm | 22 mm |
| 305/40R23 | 32.6" | 828 mm | 23 mm |
| 305/45R22 | 32.8" | 833 mm | 22 mm |
| 305/50R20 | 32" | 814 mm | 20 mm |
| 305/60R17 | 31.4" | 798 mm | 17 mm |
| 305/60R18 | 32.4" | 823 mm | 18 mm |
| 305/65R17 | 32.6" | 828 mm | 17 mm |
| 305/70R15 | 31.9" | 809 mm | 15 mm |
| 305/70R16 | 32.8" | 834 mm | 16 mm |
| 315/30R24 | 31.5" | 800 mm | 24 mm |
| 315/35R24 | 32.7" | 830 mm | 24 mm |
| 315/45R21 | 32.2" | 817 mm | 21 mm |
| 315/50R20 | 32.4" | 824 mm | 20 mm |
| 315/70R15 | 32.4" | 823 mm | 15 mm |
| 325/35R23 | 32" | 812 mm | 23 mm |
| 325/40R21 | 31.2" | 793 mm | 21 mm |
| 325/40R22 | 32.2" | 819 mm | 22 mm |
| 325/50R20 | 32.8" | 834 mm | 20 mm |
| 335/30R24 | 32" | 812 mm | 24 mm |
| 345/55R17 | 32" | 812 mm | 17 mm |
| 375/50R18 | 32.8" | 833 mm | 18 mm |
| 375/55R16 | 32.2" | 818 mm | 16 mm |
| 405/25R24 | 32" | 812 mm | 24 mm |