225/55R18 Conversion

When converted to inches, 225/55R18 is equivalent to 27.8x8.9R18.

225/55R18 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 4.9 inches (124 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 27.8 inches (705 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 87.3 inches (2213.7 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. 225/55R18 tire makes 726 revolutions per mile (452 revolutions per kilometer).

225/55R18 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 225/55R18 tire can be replaced with 70 compatible tire sizes. Select optional plus size to see its specs.

Tire Size	Overall Diameter	Difference
225/45R19	27" (685 mm)	-2.8%
285/40R18	27" (685 mm)	-2.8%
325/35R18	27" (685 mm)	-2.8%
335/30R19	27" (685 mm)	-2.8%
255/35R20	27" (686 mm)	-2.7%
295/30R20	27" (686 mm)	-2.7%
255/40R19	27" (687 mm)	-2.6%
255/45R18	27" (687 mm)	-2.6%
225/40R20	27.1" (688 mm)	-2.4%
145/80R18	27.1" (689 mm)	-2.3%
295/35R19	27.1" (689 mm)	-2.3%
165/70R18	27.1" (689 mm)	-2.3%
345/30R19	27.2" (691 mm)	-2%
305/30R20	27.2" (692 mm)	-1.8%
295/40R18	27.3" (693 mm)	-1.7%
235/50R18	27.3" (693 mm)	-1.7%
215/55R18	27.3" (693 mm)	-1.7%
175/60R19	27.3" (693 mm)	-1.7%
155/60R20	27.3" (694 mm)	-1.6%
265/35R20	27.3" (694 mm)	-1.6%
265/40R19	27.4" (695 mm)	-1.4%
265/45R18	27.4" (695 mm)	-1.4%
235/45R19	27.4" (695 mm)	-1.4%
235/40R20	27.4" (696 mm)	-1.3%
145/65R20	27.4" (696 mm)	-1.3%
305/35R19	27.4" (697 mm)	-1.1%
355/30R19	27.4" (697 mm)	-1.1%
315/30R20	27.5" (698 mm)	-1%
345/35R18	27.5" (699 mm)	-0.9%
175/55R20	27.6" (700 mm)	-0.7%
275/35R20	27.6" (700 mm)	-0.7%
155/70R19	27.6" (701 mm)	-0.6%
305/40R18	27.6" (701 mm)	-0.6%
215/45R20	27.6" (702 mm)	-0.4%
275/40R19	27.7" (703 mm)	-0.3%
315/35R19	27.7" (703 mm)	-0.3%
245/45R19	27.7" (703 mm)	-0.3%
205/60R18	27.7" (703 mm)	-0.3%
145/85R18	27.7" (703 mm)	-0.3%
245/50R18	27.7" (703 mm)	-0.3%
195/50R20	27.7" (704 mm)	-0.1%
325/30R20	27.7" (704 mm)	-0.1%
245/40R20	27.7" (704 mm)	-0.1%
275/45R18	27.8" (705 mm)	0%
155/80R18	27.8" (705 mm)	0%
165/60R20	27.8" (706 mm)	0.1%
285/35R20	27.9" (708 mm)	0.4%
315/40R18	27.9" (709 mm)	0.6%
225/45R20	28" (710 mm)	0.7%
155/65R20	28" (710 mm)	0.7%
335/30R20	28" (710 mm)	0.7%
285/40R19	28" (711 mm)	0.9%
255/40R20	28" (712 mm)	1%
255/50R18	28.1" (713 mm)	1.1%
255/45R19	28.1" (713 mm)	1.1%
285/45R18	28.1" (713 mm)	1.1%
295/35R20	28.1" (714 mm)	1.3%
145/80R19	28.1" (715 mm)	1.4%
235/55R18	28.1" (715 mm)	1.4%
345/30R20	28.2" (716 mm)	1.6%
235/50R19	28.3" (719 mm)	2%
295/40R19	28.3" (719 mm)	2%
235/45R20	28.3" (720 mm)	2.1%
265/40R20	28.3" (720 mm)	2.1%
155/85R18	28.4" (721 mm)	2.3%
265/45R19	28.4" (721 mm)	2.3%
305/35R20	28.4" (722 mm)	2.4%
265/50R18	28.5" (723 mm)	2.6%
295/45R18	28.5" (723 mm)	2.6%
345/35R19	28.5" (725 mm)	2.8%