315/45R21 Tires
315/45R21 Conversion
When converted to inches, 315/45R21 is equivalent to 32.2x12.4R21.
315/45R21 tire has a section width of 12.4 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 5.6 inches (142 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 32.2 inches (817 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 101.1 inches (2565.4 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. 315/45R21 tire makes 627 revolutions per mile (390 revolutions per kilometer).



Metric | Inches | |
---|---|---|
Overall Diameter (Tire Height) | 817 mm | 32.2" |
Tread Width | 315 mm | 12.4" |
Rim Diameter | 533.4 mm | 21" |
Sidewall Height | 142 mm | 5.6" |
Circumference | 2565.4 mm | 101.1" |
Revolutions | 390 per km | 627 per mile |
Best Prices on 315/45R21 Tires | |
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315/45R21 Replacement Tire Sizes
Replacement tires have to be within 3% of the original tire's overall diameter. 315/45R21 tire can be replaced with 17 compatible tire sizes. Select optional plus size to see its specs.
Tire Size | Overall Diameter | Difference |
---|---|---|
325/40R21 | 31.2" (793 mm) | -2.9% |
295/40R22 | 31.3" (795 mm) | -2.7% |
265/45R22 | 31.4" (797 mm) | -2.4% |
305/35R23 | 31.4" (798 mm) | -2.3% |
305/40R22 | 31.6" (803 mm) | -1.7% |
275/40R23 | 31.7" (804 mm) | -1.6% |
275/45R22 | 31.8" (807 mm) | -1.2% |
275/50R21 | 31.9" (809 mm) | -1% |
285/40R23 | 32" (812 mm) | -0.6% |
325/35R23 | 32" (812 mm) | -0.6% |
285/45R22 | 32.1" (815 mm) | -0.2% |
325/40R22 | 32.2" (819 mm) | 0.2% |
295/45R22 | 32.5" (825 mm) | 1% |
265/50R22 | 32.5" (825 mm) | 1% |
305/40R23 | 32.6" (828 mm) | 1.3% |
305/45R22 | 32.8" (833 mm) | 2% |
275/50R22 | 32.9" (835 mm) | 2.2% |