What does 275/45R21 mean?
275/45R21 is a tire size with the following dimensions:
- 275 is the width of the tire in millimeters. This number also indicates the appropriate width of the rim on which the tire should be mounted.
- 45 is the aspect ratio, which is the ratio of the tire's height to its width. This affects the tire's handling and ride comfort
- R indicates the tire's construction type, meaning it has a radial construction. This provides stability and precision to the tire.
- 21 is the diameter of the wheel in inches, on which the tire is to be mounted.
275/45R21 Tire Conversion
Dimensions | Inches | Millimeters |
Tire Diameter | 30.7 in | 780.9 mm |
Section Width | 10.8 in | 275 mm |
Rim Height | 21 in | 533 mm |
Sidewall Height | 4.9 in | 123.8 mm |
Circumference | 96.6 in | 2453.3 mm |
Revolutions | 656 revs/mile |
FAQ About 275/45R21 Tire
How tall is a 275/45R21 tire?
The height (or diameter) of a 275/45R21 tire is 30.7 inches
How wide is a 275/45R21 tire?
The width of a 275/45R21 tire is 275 mm, which is about 10.8 inches.
What size rim fits a 275/45R21 tire?
A 275/45R21 tire fits on a rim that is 21 inches in diameter.
What does the 45 in a 275/45R21 tire mean?
The 45 in a 275/45R21 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 45% of its width.
Alternative Tire Sizes for 275/45R21
Typically, it's recommended to choose a tire with a diameter (height) within 3% of the original equipment manufacturer (OEM) tire size.
However, keep in mind that this is a general guideline and not an absolute rule.
Here are some tire sizes that are compatible with the 275/45R21:
Tire Size | Diameter | Rim |
---|---|---|
255/45R21 | 30.0″ (-2.3%) | 21 x 9.5-11.0 |
255/50R21 | 31.0″ (1.0%) | 21 x 7.0-9.0 |
265/45R21 | 30.4″ (-1.0%) | 21 x 8.5-10.0 |
285/40R21 | 30.0″ (-2.3%) | 21 x 9.5-11.0 |
285/45R21 | 31.1″ (1.3%) | 21 x 9.0-10.5 |
295/40R21 | 30.3″ (-1.3%) | 21 x 10.0-11.5 |
315/40R21 | 30.9″ (0.7%) | 21 x 10.5-12.5 |
325/40R21 | 31.2″ (1.6%) | 21 x 11.0-13.0 |