315/40R21 Tire Size in Inches

315/40R21 is a metric tire size representation, which defines that the tires have a width of 315 mm, 40 is the aspect ratio and a rim diameter of 21 inches. In the imperial system the tire size 315/40R21 equates to a 30.9×12.4R21 that is commonly used in the automotive industry. So Converting 315/40R21 in inches the tires have a length of 30.9 inches, a width of 12.4 inches, a sidewall height of 5 inches and The number of complete resolutions made by the corresponding tire size is equal to 653 per mile with a circumference of 97 inches.

315/40R21 tire size in inches

315/40R21inchesmm
Tire Diameter30.9 inches785 mm
Tread Width12.4 inches315 mm
Rim Diameter21 inches533 mm
Sidewall Height5 inches126 mm
Circumference97 inches2465 mm
Revolutions653 per mile406 per km

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315/40R21 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 315/40R21 tires.

Tire Size Overall Diameter Difference
295/30R23 30″ (762 mm) -2.9%
255/40R22 30″ (763 mm) -2.8%
255/45R21 30″ (763 mm) -2.8%
295/35R22 30.1″ (765 mm) -2.5%
295/40R21 30.3″ (769 mm) -2%
265/40R22 30.4″ (771 mm) -1.8%
265/45R21 30.4″ (771 mm) -1.8%
305/35R22 30.4″ (773 mm) -1.5%
275/40R22 30.7″ (779 mm) -0.8%
315/35R22 30.7″ (779 mm) -0.8%
325/30R23 30.7″ (780 mm) -0.6%
275/45R21 30.7″ (781 mm) -0.5%
285/35R23 30.9″ (784 mm) -0.1%
285/40R22 31″ (787 mm) 0.3%
325/35R22 31″ (787 mm) 0.3%
285/45R21 31.1″ (789 mm) 0.5%
255/45R22 31.1″ (789 mm) 0.5%
255/50R21 31.1″ (789 mm) 0.5%
295/35R23 31.1″ (790 mm) 0.6%
325/40R21 31.2″ (793 mm) 1%
295/40R22 31.3″ (795 mm) 1.3%
265/45R22 31.4″ (797 mm) 1.5%
305/35R23 31.4″ (798 mm) 1.7%
305/40R22 31.6″ (803 mm) 2.3%
275/40R23 31.7″ (804 mm) 2.4%
275/45R22 31.8″ (807 mm) 2.8%

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