315/40R21 in Inches

Tire size 315/40R21 refers to the tire size in numbers and letters such as the first number “315” indicates the tire width in millimeters, the second number “40” indicates the aspect ratio of the tire and the last number indicates the diameter of the tire. A 315/40R21 tire in inches can be described as a tire with a width of about 12.4 inches, a sidewall height of about 5 inches, and it fits on a 21-inch wheel.

Converting 315/40R21 in Inches

315/40R21 inches mm
Tire Diameter 30.9 inches 785 mm
Tread Width 12.4 inches 315 mm
Rim Diameter 21 inches 533 mm
Sidewall Height 5 inches 126 mm
Circumference 97 inches 2465 mm
Revolutions 653 per mile 406 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

315/40R21 Alternate Tire Size

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%

Leave a Comment