315/45R21 in Inches

Tire size 315/45R21 refers to the tire size in numbers and letters such as the first number “315” indicates the tire width in millimeters, the second number “45” indicates the aspect ratio of the tire and the last number indicates the diameter of the tire. A 315/45R21 tire in inches can be described as a tire with a width of about 12.4 inches, a sidewall height of about 5.6 inches, and it fits on a 21-inch wheel.

Converting 315/45R21 in Inches

315/45R21 inches mm
Tire Diameter 32.2 inches 817 mm
Tread Width 12.4 inches 315 mm
Rim Diameter 21 inches 533 mm
Sidewall Height 5.6 inches 142 mm
Circumference 101.1 inches 2565 mm
Revolutions 627 per mile 390 per km

Tire Size Calculator

The Tire Size Calculator is a convenient online tool that helps determine the correct tire dimensions for a vehicle, ensuring optimal performance and compatibility.

Tire Diameter
Tread Width
Rim Diameter
Sidewall Height
Circumference
Revolutions

315/45R21 Alternate Tire Size

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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