155/80R18 Tire Size in Inches and Millimeters
155/80R18 tires have a diameter of 27.8" (705 mm), a tread width of 6.1" (155 mm), and a wheel diameter of 18" (457.2 mm).The sidewall of the tire is 4.9" (124 mm), and the tire's circumference is 87.3" (2213.7 mm). This means a 155/80R18 tire will make make 726 revolutions per mile, or 452 revolutions per kilometer.
6.1"
27.8"
87.3"
18"
4.9"
726 Revs/Mile
| Spec | Inches | Metric |
|---|---|---|
| Diameter | 27.8" | 705 mm |
| Width | 6.1" | 155 mm |
| Wheel | 18" | 457.2 mm |
| Sidewall | 4.9" | 124 mm |
| Circum | 87.3" | 2213.7 mm |
| Revolutions | 726 per mile | 452 per km |
What Does 155/80R18 Mean?
The tire size 155/80R18 is a common size used on many trucks, SUVs, and other larger vehicles.
Here is what each part of the size designation represents:
- 155: This number represents the width of the tire in millimeters. In this case, the tire is 155 millimeters wide.
- 80: 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 80% 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 155/80R18 Into Inches
The 155/80R18 conversion is fairly simple. The first number in the tire size, 155, represents the width of the tire in millimeters. To convert this to inches, we divide 155 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 6.1 inches.
The second number in the tire size, 80, represents the aspect ratio or the height of the tire as a percentage of its width. To calculate the height in inches, we multiply 6.1 by 0.80, which gives us approximately 4.9 inches.
Finally, the last number in the tire size, 18, represents the diameter of the wheel rim in inches. Therefore, the tire size 155/80R18 can be expressed in inches as roughly 6.1 inches wide, 4.9 inches tall, and designed to fit a 18-inch wheel rim.
Frequently Asked Questions About 155/80R18 Tires
How tall is a 155/80R18 tire?
A 155/80R18 tire has an approximate height, also known as the overall diameter, of 27.8 inches (705 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 155/80R18 tire?
A 155/80R18 tire has a width of approximately 6.1 inches (155 millimeters). The width of the tire is the first number in the tire size designation, which in this case is “155”. 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 155/80R18 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 |
|---|---|---|---|
| 145/65R20 | 27.4" | 696 mm | 20 mm |
| 145/80R18 | 27.1" | 689 mm | 18 mm |
| 145/80R19 | 28.1" | 715 mm | 19 mm |
| 145/85R18 | 27.7" | 703 mm | 18 mm |
| 145/90R17 | 27.3" | 694 mm | 17 mm |
| 155/60R20 | 27.3" | 694 mm | 20 mm |
| 155/65R20 | 28" | 710 mm | 20 mm |
| 155/70R19 | 27.6" | 701 mm | 19 mm |
| 155/80R18 | 27.8" | 705 mm | 18 mm |
| 155/85R18 | 28.4" | 721 mm | 18 mm |
| 155/90R16 | 27" | 686 mm | 16 mm |
| 155/90R17 | 28" | 712 mm | 17 mm |
| 165/60R20 | 27.8" | 706 mm | 20 mm |
| 165/70R18 | 27.1" | 689 mm | 18 mm |
| 165/80R17 | 27.4" | 696 mm | 17 mm |
| 175/55R20 | 27.6" | 700 mm | 20 mm |
| 175/60R19 | 27.3" | 693 mm | 19 mm |
| 175/80R16 | 27" | 686 mm | 16 mm |
| 185/75R16 | 26.9" | 684 mm | 16 mm |
| 195/50R20 | 27.7" | 704 mm | 20 mm |
| 195/75R16 | 27.5" | 698 mm | 16 mm |
| 195/80R15 | 27.3" | 693 mm | 15 mm |
| 195/80R16 | 28.3" | 718 mm | 16 mm |
| 205/60R18 | 27.7" | 703 mm | 18 mm |
| 205/65R17 | 27.5" | 698 mm | 17 mm |
| 205/70R16 | 27.3" | 694 mm | 16 mm |
| 205/75R15 | 27.1" | 689 mm | 15 mm |
| 205/75R16 | 28.1" | 714 mm | 16 mm |
| 215/45R20 | 27.6" | 702 mm | 20 mm |
| 215/55R18 | 27.3" | 693 mm | 18 mm |
| 215/60R17 | 27.2" | 690 mm | 17 mm |
| 215/65R16 | 27" | 686 mm | 16 mm |
| 215/65R17 | 28" | 712 mm | 17 mm |
| 215/70R16 | 27.9" | 708 mm | 16 mm |
| 215/75R15 | 27.7" | 703 mm | 15 mm |
| 215/80R15 | 28.5" | 725 mm | 15 mm |
| 225/30R22 | 27.4" | 695 mm | 22 mm |
| 225/40R20 | 27.1" | 688 mm | 20 mm |
| 225/45R19 | 27" | 685 mm | 19 mm |
| 225/45R20 | 28" | 710 mm | 20 mm |
| 225/55R18 | 27.8" | 705 mm | 18 mm |
| 225/60R17 | 27.6" | 702 mm | 17 mm |
| 225/65R16 | 27.5" | 698 mm | 16 mm |
| 225/65R17 | 28.5" | 724 mm | 17 mm |
| 225/70R15 | 27.4" | 697 mm | 15 mm |
| 225/70R16 | 28.4" | 722 mm | 16 mm |
| 225/75R14 | 27.3" | 694 mm | 14 mm |
| 225/75R15 | 28.3" | 719 mm | 15 mm |
| 235/30R22 | 27.6" | 701 mm | 22 mm |
| 235/35R21 | 27.4" | 697 mm | 21 mm |
| 235/40R20 | 27.4" | 696 mm | 20 mm |
| 235/45R19 | 27.4" | 695 mm | 19 mm |
| 235/45R20 | 28.3" | 720 mm | 20 mm |
| 235/50R18 | 27.3" | 693 mm | 18 mm |
| 235/50R19 | 28.3" | 719 mm | 19 mm |
| 235/55R17 | 27.2" | 690 mm | 17 mm |
| 235/55R18 | 28.1" | 715 mm | 18 mm |
| 235/60R16 | 27.1" | 688 mm | 16 mm |
| 235/60R17 | 28.1" | 714 mm | 17 mm |
| 235/65R15 | 27" | 687 mm | 15 mm |
| 235/65R16 | 28" | 712 mm | 16 mm |
| 235/70R14 | 27" | 686 mm | 14 mm |
| 235/70R15 | 28" | 711 mm | 15 mm |
| 245/30R22 | 27.8" | 707 mm | 22 mm |
| 245/35R21 | 27.8" | 705 mm | 21 mm |
| 245/40R20 | 27.7" | 704 mm | 20 mm |
| 245/45R19 | 27.7" | 703 mm | 19 mm |
| 245/50R18 | 27.7" | 703 mm | 18 mm |
| 245/55R17 | 27.6" | 702 mm | 17 mm |
| 245/60R16 | 27.6" | 700 mm | 16 mm |
| 245/60R17 | 28.6" | 726 mm | 17 mm |
| 245/65R15 | 27.5" | 699 mm | 15 mm |
| 245/70R14 | 27.6" | 700 mm | 14 mm |
| 245/70R15 | 28.5" | 725 mm | 15 mm |
| 255/30R21 | 27" | 687 mm | 21 mm |
| 255/30R22 | 28.1" | 713 mm | 22 mm |
| 255/35R20 | 27" | 686 mm | 20 mm |
| 255/35R21 | 28" | 711 mm | 21 mm |
| 255/40R19 | 27" | 687 mm | 19 mm |
| 255/40R20 | 28" | 712 mm | 20 mm |
| 255/45R18 | 27" | 687 mm | 18 mm |
| 255/45R19 | 28.1" | 713 mm | 19 mm |
| 255/50R17 | 27.1" | 688 mm | 17 mm |
| 255/50R18 | 28.1" | 713 mm | 18 mm |
| 255/55R16 | 27" | 686 mm | 16 mm |
| 255/55R17 | 28" | 712 mm | 17 mm |
| 255/60R15 | 27" | 687 mm | 15 mm |
| 255/60R16 | 28" | 712 mm | 16 mm |
| 255/65R15 | 28.1" | 713 mm | 15 mm |
| 265/25R22 | 27.2" | 691 mm | 22 mm |
| 265/25R23 | 28.2" | 716 mm | 23 mm |
| 265/30R21 | 27.3" | 693 mm | 21 mm |
| 265/30R22 | 28.3" | 719 mm | 22 mm |
| 265/35R20 | 27.3" | 694 mm | 20 mm |
| 265/35R21 | 28.3" | 719 mm | 21 mm |
| 265/40R19 | 27.4" | 695 mm | 19 mm |
| 265/40R20 | 28.3" | 720 mm | 20 mm |
| 265/45R18 | 27.4" | 695 mm | 18 mm |
| 265/45R19 | 28.4" | 721 mm | 19 mm |
| 265/50R18 | 28.5" | 723 mm | 18 mm |
| 265/55R17 | 28.5" | 724 mm | 17 mm |
| 265/60R15 | 27.5" | 699 mm | 15 mm |
| 265/60R16 | 28.5" | 724 mm | 16 mm |
| 275/25R22 | 27.4" | 697 mm | 22 mm |
| 275/30R21 | 27.5" | 699 mm | 21 mm |
| 275/30R22 | 28.5" | 725 mm | 22 mm |
| 275/35R20 | 27.6" | 700 mm | 20 mm |
| 275/35R21 | 28.5" | 725 mm | 21 mm |
| 275/40R19 | 27.7" | 703 mm | 19 mm |
| 275/45R18 | 27.8" | 705 mm | 18 mm |
| 275/50R17 | 27.9" | 708 mm | 17 mm |
| 275/55R16 | 27.9" | 708 mm | 16 mm |
| 275/60R14 | 27" | 686 mm | 14 mm |
| 275/60R15 | 28" | 711 mm | 15 mm |
| 285/25R22 | 27.6" | 701 mm | 22 mm |
| 285/30R21 | 27.8" | 705 mm | 21 mm |
| 285/35R20 | 27.9" | 708 mm | 20 mm |
| 285/40R18 | 27" | 685 mm | 18 mm |
| 285/40R19 | 28" | 711 mm | 19 mm |
| 285/45R18 | 28.1" | 713 mm | 18 mm |
| 295/25R22 | 27.8" | 707 mm | 22 mm |
| 295/30R20 | 27" | 686 mm | 20 mm |
| 295/30R21 | 28" | 711 mm | 21 mm |
| 295/35R19 | 27.1" | 689 mm | 19 mm |
| 295/35R20 | 28.1" | 714 mm | 20 mm |
| 295/40R18 | 27.3" | 693 mm | 18 mm |
| 295/40R19 | 28.3" | 719 mm | 19 mm |
| 295/45R17 | 27.5" | 698 mm | 17 mm |
| 295/45R18 | 28.5" | 723 mm | 18 mm |
| 295/50R16 | 27.6" | 702 mm | 16 mm |
| 295/55R15 | 27.8" | 705 mm | 15 mm |
| 305/25R21 | 27" | 685 mm | 21 mm |
| 305/25R22 | 28" | 711 mm | 22 mm |
| 305/30R20 | 27.2" | 692 mm | 20 mm |
| 305/30R21 | 28.2" | 717 mm | 21 mm |
| 305/35R19 | 27.4" | 697 mm | 19 mm |
| 305/35R20 | 28.4" | 722 mm | 20 mm |
| 305/40R18 | 27.6" | 701 mm | 18 mm |
| 305/45R17 | 27.8" | 706 mm | 17 mm |
| 305/50R15 | 27" | 687 mm | 15 mm |
| 315/25R22 | 28.2" | 717 mm | 22 mm |
| 315/30R20 | 27.5" | 698 mm | 20 mm |
| 315/30R21 | 28.5" | 723 mm | 21 mm |
| 315/35R19 | 27.7" | 703 mm | 19 mm |
| 315/40R18 | 27.9" | 709 mm | 18 mm |
| 315/45R16 | 27.2" | 690 mm | 16 mm |
| 315/45R17 | 28.2" | 716 mm | 17 mm |
| 325/25R21 | 27.4" | 695 mm | 21 mm |
| 325/30R20 | 27.7" | 704 mm | 20 mm |
| 325/35R18 | 27" | 685 mm | 18 mm |
| 325/50R15 | 27.8" | 707 mm | 15 mm |
| 335/30R19 | 27" | 685 mm | 19 mm |
| 335/30R20 | 28" | 710 mm | 20 mm |
| 345/30R19 | 27.2" | 691 mm | 19 mm |
| 345/30R20 | 28.2" | 716 mm | 20 mm |
| 345/35R18 | 27.5" | 699 mm | 18 mm |
| 345/35R19 | 28.5" | 725 mm | 19 mm |
| 345/40R17 | 27.9" | 708 mm | 17 mm |
| 355/25R21 | 28" | 711 mm | 21 mm |
| 355/30R19 | 27.4" | 697 mm | 19 mm |
| 355/40R16 | 27.2" | 690 mm | 16 mm |