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 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%