165/40R18 Tires

165/40R18 Conversion

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).

165/40R18 Section Width
6.5"
23.2"
165/40R18 Tire Side
Tire Circumference
72.8"
18"
2.6"
870 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 589 mm 23.2"
Tread Width 165 mm 6.5"
Rim Diameter 457.2 mm 18"
Sidewall Height 66 mm 2.6"
Circumference 1849.5 mm 72.8"
Revolutions 541 per km 870 per mile

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.

Tire Size Overall Diameter Difference
195/35R18 23.3" (593 mm) 0.7%
225/30R18 23.3" (593 mm) 0.7%
235/30R18 23.6" (599 mm) 1.7%
205/35R18 23.7" (601 mm) 2%
245/30R18 23.8" (605 mm) 2.7%