225/75R18 Tires

225/75R18 Conversion

When converted to inches, 225/75R18 is equivalent to 31.3x8.9R18.

225/75R18 tire has a section width of 8.9 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 6.7 inches (169 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 31.3 inches (795 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 98.3 inches (2496.3 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. 225/75R18 tire makes 645 revolutions per mile (401 revolutions per kilometer).

225/75R18 Section Width
8.9"
31.3"
225/75R18 Tire Side
Tire Circumference
98.3"
18"
6.7"
645 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 795 mm 31.3"
Tread Width 225 mm 8.9"
Rim Diameter 457.2 mm 18"
Sidewall Height 169 mm 6.7"
Circumference 2496.3 mm 98.3"
Revolutions 401 per km 645 per mile

225/75R18 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 225/75R18 tire can be replaced with 31 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
175/90R18 30.4" (773 mm) -2.8%
265/50R20 30.5" (774 mm) -2.6%
295/45R20 30.5" (774 mm) -2.6%
265/60R18 30.5" (775 mm) -2.5%
265/55R19 30.5" (775 mm) -2.5%
245/65R18 30.5" (775 mm) -2.5%
165/90R19 30.7" (781 mm) -1.8%
305/45R20 30.8" (782 mm) -1.6%
275/50R20 30.9" (784 mm) -1.4%
275/55R19 30.9" (785 mm) -1.3%
275/60R18 31" (787 mm) -1%
235/70R18 31" (787 mm) -1%
255/55R20 31" (788 mm) -0.9%
255/60R19 31.1" (789 mm) -0.8%
255/65R18 31.1" (789 mm) -0.8%
235/65R19 31.1" (789 mm) -0.8%
285/50R20 31.3" (794 mm) -0.1%
285/55R19 31.4" (797 mm) 0.3%
285/60R18 31.5" (799 mm) 0.5%
245/70R18 31.5" (801 mm) 0.8%
265/65R18 31.5" (801 mm) 0.8%
245/60R20 31.6" (802 mm) 0.9%
295/50R20 31.7" (804 mm) 1.1%
235/75R18 31.9" (809 mm) 1.8%
275/55R20 31.9" (810 mm) 1.9%
225/70R19.5 31.9" (811 mm) 2%
255/60R20 32" (814 mm) 2.4%
305/50R20 32" (814 mm) 2.4%
255/70R18 32.1" (815 mm) 2.5%
275/65R18 32.1" (815 mm) 2.5%
255/65R19 32.1" (815 mm) 2.5%