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).
Overall Diameter (Tire Height)
401 per km
645 per mile
Best Prices on 225/75R18 Tires
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.