305/70R15 Conversion

When converted to inches, 305/70R15 is equivalent to 31.9x12R15.

305/70R15 tire has a section width of 12 inches which is the measurement of tire's width from its inner sidewall to its outer sidewall. Rim diameter of 15 inches represents the size of the wheel the tire can be mounted on. Sidewall height of 8.4 inches (214 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 31.9 inches (809 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 100.2 inches (2540.3 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. 305/70R15 tire makes 632 revolutions per mile (394 revolutions per kilometer).

305/70R15 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 305/70R15 tire can be replaced with 24 compatible tire sizes. Select optional plus size to see its specs.

Tire Size	Overall Diameter	Difference
345/55R16	30.9" (786 mm)	-2.8%
225/85R16	31" (788 mm)	-2.6%
295/65R16	31.1" (790 mm)	-2.3%
275/65R17	31.1" (790 mm)	-2.3%
255/70R17	31.1" (790 mm)	-2.3%
275/70R16	31.2" (792 mm)	-2.1%
305/60R17	31.4" (798 mm)	-1.4%
245/75R17	31.5" (800 mm)	-1.1%
285/65R17	31.6" (802 mm)	-0.9%
265/70R17	31.7" (804 mm)	-0.6%
265/75R16	31.7" (804 mm)	-0.6%
285/70R16	31.7" (806 mm)	-0.4%
235/85R16	31.7" (806 mm)	-0.4%
235/80R17	31.8" (808 mm)	-0.1%
345/55R17	32" (812 mm)	0.4%
225/90R16	32" (812 mm)	0.4%
255/75R17	32" (814 mm)	0.6%
275/70R17	32.2" (818 mm)	1.1%
375/55R16	32.2" (818 mm)	1.1%
315/70R15	32.4" (823 mm)	1.7%
305/65R17	32.6" (828 mm)	2.3%
265/80R16	32.7" (830 mm)	2.6%
285/70R17	32.8" (832 mm)	2.8%
235/85R17	32.8" (832 mm)	2.8%