215/45R18 Tire Size in Inches and Millimeters
215/45R18 tires have a diameter of 25.6" (651 mm), a tread width of 8.5" (215 mm), and a wheel diameter of 18" (457.2 mm).The sidewall of the tire is 3.8" (97 mm), and the tire's circumference is 80.4" (2044.1 mm). This means a 215/45R18 tire will make make 788 revolutions per mile, or 489 revolutions per kilometer.
Spec | Inches | Metric |
---|---|---|
Diameter | 25.6" | 651 mm |
Width | 8.5" | 215 mm |
Wheel | 18" | 457.2 mm |
Sidewall | 3.8" | 97 mm |
Circum | 80.4" | 2044.1 mm |
Revolutions | 788 per mile | 489 per km |
What Does 215/45R18 Mean?
The tire size 215/45R18 is a common size used on many trucks, SUVs, and other larger vehicles.
Here is what each part of the size designation represents:
- 215: This number represents the width of the tire in millimeters. In this case, the tire is 215 millimeters wide.
- 45: 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 45% 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 215/45R18 Into Inches
The 215/45R18 conversion is fairly simple. The first number in the tire size, 215, represents the width of the tire in millimeters. To convert this to inches, we divide 215 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 8.5 inches.
The second number in the tire size, 45, represents the aspect ratio or the height of the tire as a percentage of its width. To calculate the height in inches, we multiply 8.5 by 0.45, which gives us approximately 3.8 inches.
Finally, the last number in the tire size, 18, represents the diameter of the wheel rim in inches. Therefore, the tire size 215/45R18 can be expressed in inches as roughly 8.5 inches wide, 3.8 inches tall, and designed to fit a 18-inch wheel rim.
Frequently Asked Questions About 215/45R18 Tires
How tall is a 215/45R18 tire?
A 215/45R18 tire has an approximate height, also known as the overall diameter, of 25.6 inches (651 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 215/45R18 tire?
A 215/45R18 tire has a width of approximately 8.5 inches (215 millimeters). The width of the tire is the first number in the tire size designation, which in this case is “215”. 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 215/45R18 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 |
---|---|---|---|
115/70R19 | 25.4" | 645 mm | 19 mm |
115/95R17 | 25.6" | 650 mm | 17 mm |
125/70R18 | 24.9" | 633 mm | 18 mm |
125/70R19 | 25.9" | 659 mm | 19 mm |
125/80R17 | 24.9" | 632 mm | 17 mm |
125/90R16 | 24.9" | 632 mm | 16 mm |
135/60R19 | 25.4" | 645 mm | 19 mm |
135/70R18 | 25.5" | 647 mm | 18 mm |
135/80R17 | 25.5" | 648 mm | 17 mm |
135/90R16 | 25.6" | 650 mm | 16 mm |
145/65R18 | 25.4" | 645 mm | 18 mm |
145/70R17 | 25" | 636 mm | 17 mm |
145/70R18 | 26" | 661 mm | 18 mm |
145/80R16 | 25.1" | 638 mm | 16 mm |
145/80R17 | 26.1" | 664 mm | 17 mm |
145/90R16 | 26.3" | 668 mm | 16 mm |
155/60R18 | 25.3" | 643 mm | 18 mm |
155/70R17 | 25.6" | 650 mm | 17 mm |
155/80R16 | 25.7" | 654 mm | 16 mm |
165/70R17 | 26.1" | 664 mm | 17 mm |
165/80R15 | 25.4" | 645 mm | 15 mm |
165/80R16 | 26.4" | 670 mm | 16 mm |
175/75R15 | 25.3" | 643 mm | 15 mm |
175/75R16 | 26.3" | 668 mm | 16 mm |
175/80R14 | 25" | 636 mm | 14 mm |
185/55R18 | 26" | 661 mm | 18 mm |
185/60R17 | 25.7" | 654 mm | 17 mm |
185/65R16 | 25.4" | 646 mm | 16 mm |
185/70R15 | 25.2" | 641 mm | 15 mm |
185/75R14 | 25" | 634 mm | 14 mm |
185/80R14 | 25.7" | 652 mm | 14 mm |
195/55R17 | 25.4" | 646 mm | 17 mm |
195/60R16 | 25.2" | 640 mm | 16 mm |
195/65R15 | 25" | 635 mm | 15 mm |
195/65R16 | 26" | 660 mm | 16 mm |
195/70R15 | 25.8" | 655 mm | 15 mm |
195/75R14 | 25.5" | 648 mm | 14 mm |
195/80R14 | 26.3" | 668 mm | 14 mm |
205/45R18 | 25.2" | 641 mm | 18 mm |
205/50R17 | 25.1" | 638 mm | 17 mm |
205/50R18 | 26.1" | 663 mm | 18 mm |
205/55R16 | 24.9" | 632 mm | 16 mm |
205/55R17 | 25.9" | 658 mm | 17 mm |
205/60R16 | 25.7" | 652 mm | 16 mm |
205/65R15 | 25.5" | 647 mm | 15 mm |
205/70R14 | 25.4" | 644 mm | 14 mm |
205/70R15 | 26.3" | 669 mm | 15 mm |
205/75R14 | 26.1" | 664 mm | 14 mm |
215/30R20 | 25.1" | 638 mm | 20 mm |
215/35R19 | 24.9" | 633 mm | 19 mm |
215/40R19 | 25.8" | 655 mm | 19 mm |
215/45R18 | 25.6" | 651 mm | 18 mm |
215/50R17 | 25.5" | 648 mm | 17 mm |
215/55R16 | 25.3" | 642 mm | 16 mm |
215/55R17 | 26.3" | 668 mm | 17 mm |
215/60R15 | 25.2" | 639 mm | 15 mm |
215/60R16 | 26.1" | 664 mm | 16 mm |
215/65R14 | 25" | 636 mm | 14 mm |
215/65R15 | 26" | 661 mm | 15 mm |
215/70R14 | 25.9" | 658 mm | 14 mm |
225/30R20 | 25.4" | 644 mm | 20 mm |
225/35R19 | 25.2" | 641 mm | 19 mm |
225/35R20 | 26.2" | 666 mm | 20 mm |
225/40R18 | 25.1" | 637 mm | 18 mm |
225/40R19 | 26.1" | 663 mm | 19 mm |
225/45R17 | 25" | 634 mm | 17 mm |
225/45R18 | 25.9" | 659 mm | 18 mm |
225/50R16 | 24.9" | 632 mm | 16 mm |
225/50R17 | 25.9" | 658 mm | 17 mm |
225/55R16 | 25.7" | 654 mm | 16 mm |
225/60R15 | 25.6" | 651 mm | 15 mm |
235/30R20 | 25.6" | 650 mm | 20 mm |
235/35R19 | 25.5" | 647 mm | 19 mm |
235/40R18 | 25.4" | 645 mm | 18 mm |
235/45R17 | 25.4" | 644 mm | 17 mm |
235/45R18 | 26.3" | 669 mm | 18 mm |
235/50R16 | 25.3" | 642 mm | 16 mm |
235/50R17 | 26.3" | 668 mm | 17 mm |
235/55R15 | 25.2" | 639 mm | 15 mm |
235/55R16 | 26.1" | 664 mm | 16 mm |
235/60R14 | 25.1" | 638 mm | 14 mm |
235/60R15 | 26.1" | 663 mm | 15 mm |
240/55R16 | 26.4" | 670 mm | 16 mm |
245/30R20 | 25.8" | 656 mm | 20 mm |
245/35R19 | 25.8" | 655 mm | 19 mm |
245/40R18 | 25.7" | 653 mm | 18 mm |
245/45R17 | 25.7" | 652 mm | 17 mm |
245/50R16 | 25.7" | 652 mm | 16 mm |
245/60R14 | 25.6" | 650 mm | 14 mm |
255/30R19 | 25.1" | 637 mm | 19 mm |
255/30R20 | 26.1" | 662 mm | 20 mm |
255/35R18 | 25" | 635 mm | 18 mm |
255/35R19 | 26" | 661 mm | 19 mm |
255/40R17 | 25" | 636 mm | 17 mm |
255/40R18 | 26" | 661 mm | 18 mm |
255/45R17 | 26.1" | 662 mm | 17 mm |
255/50R16 | 26.1" | 662 mm | 16 mm |
255/55R14 | 25" | 636 mm | 14 mm |
255/55R15 | 26" | 661 mm | 15 mm |
255/60R14 | 26.1" | 662 mm | 14 mm |
265/30R19 | 25.3" | 643 mm | 19 mm |
265/30R20 | 26.3" | 668 mm | 20 mm |
265/35R18 | 25.3" | 643 mm | 18 mm |
265/35R19 | 26.3" | 669 mm | 19 mm |
265/40R17 | 25.4" | 644 mm | 17 mm |
265/40R18 | 26.3" | 669 mm | 18 mm |
265/45R16 | 25.4" | 644 mm | 16 mm |
265/50R15 | 25.5" | 647 mm | 15 mm |
275/25R20 | 25.4" | 646 mm | 20 mm |
275/30R19 | 25.6" | 649 mm | 19 mm |
275/35R18 | 25.6" | 649 mm | 18 mm |
275/40R17 | 25.7" | 652 mm | 17 mm |
275/45R16 | 25.7" | 654 mm | 16 mm |
275/50R15 | 25.9" | 657 mm | 15 mm |
285/25R20 | 25.6" | 650 mm | 20 mm |
285/30R19 | 25.8" | 655 mm | 19 mm |
285/35R17 | 24.9" | 632 mm | 17 mm |
285/35R18 | 25.9" | 657 mm | 18 mm |
285/40R17 | 26" | 660 mm | 17 mm |
285/50R15 | 26.3" | 667 mm | 15 mm |
295/25R20 | 25.8" | 656 mm | 20 mm |
295/30R18 | 25" | 635 mm | 18 mm |
295/30R19 | 26" | 661 mm | 19 mm |
295/35R17 | 25.1" | 638 mm | 17 mm |
295/35R18 | 26.1" | 663 mm | 18 mm |
295/40R17 | 26.3" | 668 mm | 17 mm |
305/25R19 | 25" | 635 mm | 19 mm |
305/25R20 | 26" | 660 mm | 20 mm |
305/30R18 | 25.2" | 641 mm | 18 mm |
305/30R19 | 26.3" | 667 mm | 19 mm |
305/35R17 | 25.4" | 646 mm | 17 mm |
315/25R19 | 25.2" | 641 mm | 19 mm |
315/25R20 | 26.2" | 666 mm | 20 mm |
315/30R18 | 25.5" | 647 mm | 18 mm |
315/35R17 | 25.7" | 652 mm | 17 mm |
315/40R16 | 25.9" | 658 mm | 16 mm |
325/25R20 | 26.4" | 670 mm | 20 mm |
335/25R19 | 25.6" | 651 mm | 19 mm |
335/30R18 | 25.9" | 659 mm | 18 mm |
335/35R17 | 26.2" | 666 mm | 17 mm |
345/30R18 | 26.2" | 665 mm | 18 mm |
355/25R19 | 26" | 661 mm | 19 mm |