315/45R21 Tire Size in Inches

315/45R21 is a metric tire size representation, which defines that the tires have a width of 315 mm, 45 is the aspect ratio and a rim diameter of 21 inches. In the imperial system the tire size 315/45R21 equates to a 32.2×12.4R21 that is commonly used in the automotive industry. So Converting 315/45R21 in inches the tires have a length of 32.2 inches, a width of 12.4 inches, a sidewall height of 5.6 inches and The number of complete resolutions made by the corresponding tire size is equal to 627 per mile with a circumference of 101.1 inches.

315/45R21 tire size in inches

315/45R21inchesmm
Tire Diameter32.2 inches817 mm
Tread Width12.4 inches315 mm
Rim Diameter21 inches533 mm
Sidewall Height5.6 inches142 mm
Circumference101.1 inches2565 mm
Revolutions627 per mile390 per km

Tire Size Calculator

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315/45R21 Equivalent Tire Sizes for replacement

If you are replacing your tires, always keep in mind that they are compatible with your vehicle so that the impact on the overall performance of your vehicle can be reduced. Here we have listed some tire size that is equivalent to 315/45R21 tires.

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%

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