305/65R18 Tires

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 Section Width
12"
33.6"
305/65R18 Tire Side
Tire Circumference
105.5"
18"
7.8"
601 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 853 mm 33.6"
Tread Width 305 mm 12"
Rim Diameter 457.2 mm 18"
Sidewall Height 198 mm 7.8"
Circumference 2678.4 mm 105.5"
Revolutions 373 per km 601 per mile

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%