325/40R21 Tires
325/40R21 Conversion
When converted to inches, 325/40R21 is equivalent to 31.2x12.8R21.
325/40R21 tire has a section width of 12.8 inches which is the measurement of tire's width from its inner sidewall to its outer sidewall. Rim diameter of 21 inches represents the size of the wheel the tire can be mounted on. Sidewall height of 5.1 inches (130 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 31.2 inches (793 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 98 inches (2490 mm) is the outer perimeter of the tire. Tire revolutions indicate the number of times a tire revolves while it covers the distance in miles or kilometers. 325/40R21 tire makes 647 revolutions per mile (402 revolutions per kilometer).
| Metric | Inches | |
|---|---|---|
| Overall Diameter (Tire Height) | 793 mm | 31.2" |
| Tread Width | 325 mm | 12.8" |
| Rim Diameter | 533.4 mm | 21" |
| Sidewall Height | 130 mm | 5.1" |
| Circumference | 2490 mm | 98" |
| Revolutions | 402 per km | 647 per mile |
| Best Prices on 325/40R21 Tires | |
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325/40R21 Replacement Tire Sizes
Replacement tires have to be within 3% of the original tire's overall diameter. 325/40R21 tire can be replaced with 25 compatible tire sizes. Select optional plus size to see its specs.
| Tire Size | Overall Diameter | Difference |
|---|---|---|
| 265/40R22 | 30.4" (771 mm) | -2.8% |
| 265/45R21 | 30.4" (771 mm) | -2.8% |
| 305/35R22 | 30.4" (773 mm) | -2.5% |
| 275/40R22 | 30.7" (779 mm) | -1.8% |
| 315/35R22 | 30.7" (779 mm) | -1.8% |
| 325/30R23 | 30.7" (780 mm) | -1.6% |
| 275/45R21 | 30.7" (781 mm) | -1.5% |
| 285/35R23 | 30.9" (784 mm) | -1.1% |
| 315/40R21 | 30.9" (785 mm) | -1% |
| 325/35R22 | 31" (787 mm) | -0.8% |
| 285/40R22 | 31" (787 mm) | -0.8% |
| 255/45R22 | 31.1" (789 mm) | -0.5% |
| 255/50R21 | 31.1" (789 mm) | -0.5% |
| 285/45R21 | 31.1" (789 mm) | -0.5% |
| 295/35R23 | 31.1" (790 mm) | -0.4% |
| 295/40R22 | 31.3" (795 mm) | 0.3% |
| 265/45R22 | 31.4" (797 mm) | 0.5% |
| 305/35R23 | 31.4" (798 mm) | 0.6% |
| 305/40R22 | 31.6" (803 mm) | 1.3% |
| 275/40R23 | 31.7" (804 mm) | 1.4% |
| 275/45R22 | 31.8" (807 mm) | 1.8% |
| 275/50R21 | 31.9" (809 mm) | 2% |
| 285/40R23 | 32" (812 mm) | 2.4% |
| 325/35R23 | 32" (812 mm) | 2.4% |
| 285/45R22 | 32.1" (815 mm) | 2.8% |