What does 315/20R30 mean?
315/20R30 is a tire size with the following dimensions:
- 315 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.
- 20 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.
- 30 is the diameter of the wheel in inches, on which the tire is to be mounted.
315/20R30 Tire Conversion
| Dimensions | Inches | Millimeters |
| Tire Diameter | 35 in | 888 mm |
| Section Width | 12.4 in | 315 mm |
| Rim Height | 30 in | 762 mm |
| Sidewall Height | 2.5 in | 63 mm |
| Circumference | 109.8 in | 2789.7 mm |
| Revolutions | 576.9 revs/mile | |
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FAQ About 315/20R30 Tire
How tall is a 315/20R30 tire?
The height (or diameter) of a 315/20R30 tire is 35 inches
How wide is a 315/20R30 tire?
The width of a 315/20R30 tire is 315 mm, which is about 12.4 inches.
What size rim fits a 315/20R30 tire?
A 315/20R30 tire fits on a rim that is 30 inches in diameter.
What does the 20 in a 315/20R30 tire mean?
The 20 in a 315/20R30 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 20% of its width.
Alternative Tire Sizes for 315/20R30
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 315/20R30:
| Tire Size | Diameter | Rim |
|---|---|---|
| 255/30R30 | 36.0″ (2.9%) | 30 x n/a |
| 275/25R30 | 35.4″ (1.1%) | 30 x n/a |