305/75R18 Tires

305/75R18 Conversion

When converted to inches, 305/75R18 is equivalent to 36x12R18.

305/75R18 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 9 inches (229 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 36 inches (915 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 113 inches (2873.1 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. 305/75R18 tire makes 561 revolutions per mile (348 revolutions per kilometer).

305/75R18 Section Width
12"
36"
305/75R18 Tire Side
Tire Circumference
113"
18"
9"
561 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 915 mm 36"
Tread Width 305 mm 12"
Rim Diameter 457.2 mm 18"
Sidewall Height 229 mm 9"
Circumference 2873.1 mm 113"
Revolutions 348 per km 561 per mile

305/75R18 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 305/75R18 tire can be replaced with 8 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
295/65R20 35.1" (892 mm) -2.5%
275/80R18 35.3" (897 mm) -2%
325/60R20 35.4" (898 mm) -1.9%
315/70R18 35.4" (899 mm) -1.7%
375/60R18 35.7" (907 mm) -0.9%
355/65R18 36.2" (919 mm) 0.4%
375/55R20 36.2" (920 mm) 0.5%
355/60R20 36.8" (934 mm) 2.1%