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).

315/45R21 Section Width
12.4"
32.2"
315/45R21 Tire Side
Tire Circumference
101.1"
21"
5.6"
627 Revs/Mile
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

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%