When converted to inches, 165/40R18 is equivalent to 23.2x6.5R18.
165/40R18 tire has a section width of 6.5 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 2.6 inches (66 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 23.2 inches (589 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 72.8 inches (1849.5 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. 165/40R18 tire makes 870 revolutions per mile (541 revolutions per kilometer).
Overall Diameter (Tire Height)
541 per km
870 per mile
Best Prices on 165/40R18 Tires
165/40R18 Replacement Tire Sizes
Replacement tires have to be within 3% of the original tire's overall diameter. 165/40R18 tire can be replaced with 5 compatible tire sizes. Select optional plus size to see its specs.