305/65R18 Conversion

When converted to inches, 305/65R18 is equivalent to 33.6x12R18.

305/65R18 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 18 inches represents the size of the wheel the tire can be mounted on. Sidewall height of 7.8 inches (198 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 33.6 inches (853 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 105.5 inches (2678.4 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. 305/65R18 tire makes 601 revolutions per mile (373 revolutions per kilometer).

305/65R18 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 305/65R18 tire can be replaced with 21 compatible tire sizes. Select optional plus size to see its specs.

Tire Size	Overall Diameter	Difference
265/70R18	32.6" (829 mm)	-2.8%
295/55R20	32.8" (832 mm)	-2.5%
375/50R18	32.8" (833 mm)	-2.3%
325/50R20	32.8" (834 mm)	-2.2%
275/60R20	33" (838 mm)	-1.8%
245/70R19.5	33" (839 mm)	-1.6%
295/65R18	33.1" (841 mm)	-1.4%
275/70R18	33.2" (843 mm)	-1.2%
305/55R20	33.2" (844 mm)	-1.1%
375/45R20	33.3" (846 mm)	-0.8%
325/60R18	33.3" (847 mm)	-0.7%
285/60R20	33.5" (850 mm)	-0.4%
285/70R18	33.7" (857 mm)	0.5%
295/60R20	33.9" (862 mm)	1.1%
355/50R20	34" (864 mm)	1.3%
275/65R20	34.1" (866 mm)	1.5%
295/70R18	34.3" (871 mm)	2.1%
345/60R18	34.3" (871 mm)	2.1%
305/60R20	34.4" (874 mm)	2.5%
335/55R20	34.5" (876 mm)	2.7%
285/65R20	34.6" (878 mm)	2.9%