175/90R18 Tires

175/90R18 Conversion

When converted to inches, 175/90R18 is equivalent to 30.4x6.9R18.

175/90R18 tire has a section width of 6.9 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 6.2 inches (158 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 30.4 inches (773 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 95.5 inches (2427.2 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. 175/90R18 tire makes 663 revolutions per mile (412 revolutions per kilometer).

175/90R18 Section Width
6.9"
30.4"
175/90R18 Tire Side
Tire Circumference
95.5"
18"
6.2"
663 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 773 mm 30.4"
Tread Width 175 mm 6.9"
Rim Diameter 457.2 mm 18"
Sidewall Height 158 mm 6.2"
Circumference 2427.2 mm 95.5"
Revolutions 412 per km 663 per mile

175/90R18 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 175/90R18 tire can be replaced with 34 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
245/60R18 29.6" (751 mm) -2.8%
305/40R20 29.6" (752 mm) -2.7%
245/55R19 29.6" (753 mm) -2.6%
245/50R20 29.7" (754 mm) -2.5%
165/90R18 29.7" (755 mm) -2.3%
275/45R20 29.8" (756 mm) -2.2%
275/50R19 29.9" (759 mm) -1.8%
275/55R18 29.9" (759 mm) -1.8%
255/60R18 30" (763 mm) -1.3%
255/55R19 30" (763 mm) -1.3%
175/80R19 30" (763 mm) -1.3%
235/65R18 30" (763 mm) -1.3%
255/50R20 30.1" (764 mm) -1.2%
285/45R20 30.1" (764 mm) -1.2%
235/60R19 30.1" (765 mm) -1%
235/55R20 30.2" (766 mm) -0.9%
285/55R18 30.4" (771 mm) -0.3%
265/50R20 30.5" (774 mm) 0.1%
295/45R20 30.5" (774 mm) 0.1%
245/65R18 30.5" (775 mm) 0.3%
265/55R19 30.5" (775 mm) 0.3%
265/60R18 30.5" (775 mm) 0.3%
165/90R19 30.7" (781 mm) 1%
305/45R20 30.8" (782 mm) 1.2%
275/50R20 30.9" (784 mm) 1.4%
275/55R19 30.9" (785 mm) 1.6%
275/60R18 31" (787 mm) 1.8%
235/70R18 31" (787 mm) 1.8%
255/55R20 31" (788 mm) 1.9%
235/65R19 31.1" (789 mm) 2.1%
255/65R18 31.1" (789 mm) 2.1%
255/60R19 31.1" (789 mm) 2.1%
285/50R20 31.3" (794 mm) 2.7%
225/75R18 31.3" (795 mm) 2.8%