265/45R21 Tire Size in Inches and Millimeters
265/45R21 tires have a diameter of 30.4" (771 mm), a tread width of 10.4" (265 mm), and a wheel diameter of 21" (533.4 mm).The sidewall of the tire is 4.7" (119 mm), and the tire's circumference is 95.5" (2420.9 mm). This means a 265/45R21 tire will make make 663 revolutions per mile, or 413 revolutions per kilometer.
Spec | Inches | Metric |
---|---|---|
Diameter | 30.4" | 771 mm |
Width | 10.4" | 265 mm |
Wheel | 21" | 533.4 mm |
Sidewall | 4.7" | 119 mm |
Circum | 95.5" | 2420.9 mm |
Revolutions | 663 per mile | 413 per km |
What Does 265/45R21 Mean?
The tire size 265/45R21 is a common size used on many trucks, SUVs, and other larger vehicles.
Here is what each part of the size designation represents:
- 265: This number represents the width of the tire in millimeters. In this case, the tire is 265 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.
- 21: 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 21-inch wheel.
How To Convert 265/45R21 Into Inches
The 265/45R21 conversion is fairly simple. The first number in the tire size, 265, represents the width of the tire in millimeters. To convert this to inches, we divide 265 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 10.4 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 10.4 by 0.45, which gives us approximately 4.7 inches.
Finally, the last number in the tire size, 21, represents the diameter of the wheel rim in inches. Therefore, the tire size 265/45R21 can be expressed in inches as roughly 10.4 inches wide, 4.7 inches tall, and designed to fit a 21-inch wheel rim.
Frequently Asked Questions About 265/45R21 Tires
How tall is a 265/45R21 tire?
A 265/45R21 tire has an approximate height, also known as the overall diameter, of 30.4 inches (771 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 265/45R21 tire?
A 265/45R21 tire has a width of approximately 10.4 inches (265 millimeters). The width of the tire is the first number in the tire size designation, which in this case is “265”. 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 265/45R21 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 |
---|---|---|---|
165/90R18 | 29.7" | 755 mm | 18 mm |
165/90R19 | 30.7" | 781 mm | 19 mm |
175/80R19 | 30" | 763 mm | 19 mm |
175/90R17 | 29.4" | 748 mm | 17 mm |
175/90R18 | 30.4" | 773 mm | 18 mm |
205/90R15 | 29.6" | 751 mm | 15 mm |
215/80R16 | 29.5" | 750 mm | 16 mm |
215/85R16 | 30.4" | 772 mm | 16 mm |
225/65R18 | 29.5" | 749 mm | 18 mm |
225/70R17 | 29.4" | 748 mm | 17 mm |
225/75R17 | 30.3" | 770 mm | 17 mm |
225/85R16 | 31" | 788 mm | 16 mm |
235/55R20 | 30.2" | 766 mm | 20 mm |
235/60R19 | 30.1" | 765 mm | 19 mm |
235/65R18 | 30" | 763 mm | 18 mm |
235/65R19 | 31.1" | 789 mm | 19 mm |
235/70R17 | 30" | 762 mm | 17 mm |
235/70R18 | 31" | 787 mm | 18 mm |
235/75R16 | 29.8" | 758 mm | 16 mm |
235/75R17 | 30.9" | 784 mm | 17 mm |
235/80R15 | 29.8" | 757 mm | 15 mm |
235/80R16 | 30.8" | 782 mm | 16 mm |
245/30R24 | 29.8" | 758 mm | 24 mm |
245/45R21 | 29.6" | 753 mm | 21 mm |
245/50R20 | 29.7" | 754 mm | 20 mm |
245/55R19 | 29.6" | 753 mm | 19 mm |
245/60R18 | 29.6" | 751 mm | 18 mm |
245/65R17 | 29.5" | 750 mm | 17 mm |
245/65R18 | 30.5" | 775 mm | 18 mm |
245/70R16 | 29.5" | 750 mm | 16 mm |
245/70R17 | 30.6" | 776 mm | 17 mm |
245/75R15 | 29.5" | 749 mm | 15 mm |
245/75R16 | 30.5" | 774 mm | 16 mm |
247/70R16 | 29.6" | 752 mm | 16 mm |
255/30R24 | 30.1" | 764 mm | 24 mm |
255/40R22 | 30" | 763 mm | 22 mm |
255/45R21 | 30" | 763 mm | 21 mm |
255/45R22 | 31.1" | 789 mm | 22 mm |
255/50R20 | 30.1" | 764 mm | 20 mm |
255/50R21 | 31.1" | 789 mm | 21 mm |
255/55R19 | 30" | 763 mm | 19 mm |
255/55R20 | 31" | 788 mm | 20 mm |
255/60R18 | 30" | 763 mm | 18 mm |
255/60R19 | 31.1" | 789 mm | 19 mm |
255/65R17 | 30.1" | 764 mm | 17 mm |
255/65R18 | 31.1" | 789 mm | 18 mm |
255/70R16 | 30.1" | 764 mm | 16 mm |
255/70R17 | 31.1" | 790 mm | 17 mm |
255/75R15 | 30" | 763 mm | 15 mm |
265/40R22 | 30.4" | 771 mm | 22 mm |
265/45R21 | 30.4" | 771 mm | 21 mm |
265/50R19 | 29.5" | 749 mm | 19 mm |
265/50R20 | 30.5" | 774 mm | 20 mm |
265/55R18 | 29.5" | 749 mm | 18 mm |
265/55R19 | 30.5" | 775 mm | 19 mm |
265/60R17 | 29.5" | 750 mm | 17 mm |
265/60R18 | 30.5" | 775 mm | 18 mm |
265/65R16 | 29.5" | 750 mm | 16 mm |
265/65R17 | 30.6" | 776 mm | 17 mm |
265/70R15 | 29.6" | 753 mm | 15 mm |
265/70R16 | 30.6" | 778 mm | 16 mm |
265/75R15 | 30.7" | 779 mm | 15 mm |
275/25R24 | 29.4" | 748 mm | 24 mm |
275/30R24 | 30.6" | 776 mm | 24 mm |
275/35R22 | 29.6" | 751 mm | 22 mm |
275/40R21 | 29.6" | 753 mm | 21 mm |
275/40R22 | 30.7" | 779 mm | 22 mm |
275/45R20 | 29.8" | 756 mm | 20 mm |
275/45R21 | 30.7" | 781 mm | 21 mm |
275/50R19 | 29.9" | 759 mm | 19 mm |
275/50R20 | 30.9" | 784 mm | 20 mm |
275/55R18 | 29.9" | 759 mm | 18 mm |
275/55R19 | 30.9" | 785 mm | 19 mm |
275/60R17 | 30" | 762 mm | 17 mm |
275/60R18 | 31" | 787 mm | 18 mm |
275/65R16 | 30.1" | 764 mm | 16 mm |
275/65R17 | 31.1" | 790 mm | 17 mm |
275/70R15 | 30.2" | 767 mm | 15 mm |
275/70R16 | 31.2" | 792 mm | 16 mm |
285/30R24 | 30.8" | 782 mm | 24 mm |
285/35R22 | 29.9" | 759 mm | 22 mm |
285/35R23 | 30.9" | 784 mm | 23 mm |
285/40R21 | 30" | 761 mm | 21 mm |
285/40R22 | 31" | 787 mm | 22 mm |
285/45R20 | 30.1" | 764 mm | 20 mm |
285/45R21 | 31.1" | 789 mm | 21 mm |
285/50R20 | 31.3" | 794 mm | 20 mm |
285/55R18 | 30.4" | 771 mm | 18 mm |
285/60R16 | 29.4" | 748 mm | 16 mm |
285/60R17 | 30.5" | 774 mm | 17 mm |
285/65R16 | 30.6" | 776 mm | 16 mm |
285/70R15 | 30.7" | 781 mm | 15 mm |
295/30R23 | 30" | 762 mm | 23 mm |
295/30R24 | 31" | 788 mm | 24 mm |
295/35R22 | 30.1" | 765 mm | 22 mm |
295/35R23 | 31.1" | 790 mm | 23 mm |
295/40R21 | 30.3" | 769 mm | 21 mm |
295/45R19 | 29.5" | 749 mm | 19 mm |
295/45R20 | 30.5" | 774 mm | 20 mm |
295/65R15 | 30.1" | 765 mm | 15 mm |
295/65R16 | 31.1" | 790 mm | 16 mm |
305/35R22 | 30.4" | 773 mm | 22 mm |
305/40R20 | 29.6" | 752 mm | 20 mm |
305/45R20 | 30.8" | 782 mm | 20 mm |
315/30R22 | 29.5" | 749 mm | 22 mm |
315/35R21 | 29.6" | 753 mm | 21 mm |
315/35R22 | 30.7" | 779 mm | 22 mm |
315/40R21 | 30.9" | 785 mm | 21 mm |
315/55R16 | 29.6" | 752 mm | 16 mm |
315/60R15 | 29.9" | 759 mm | 15 mm |
325/30R23 | 30.7" | 780 mm | 23 mm |
325/35R22 | 31" | 787 mm | 22 mm |
325/40R21 | 31.2" | 793 mm | 21 mm |
325/45R18 | 29.5" | 749 mm | 18 mm |
325/60R15 | 30.4" | 771 mm | 15 mm |
345/55R15 | 30" | 761 mm | 15 mm |
345/55R16 | 30.9" | 786 mm | 16 mm |
355/25R24 | 31" | 788 mm | 24 mm |