285/40R18 Conversion

When converted to inches, 285/40R18 is equivalent to 27x11.2R18.

285/40R18 tire has a section width of 11.2 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 4.5 inches (114 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 27 inches (685 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 84.8 inches (2150.9 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. 285/40R18 tire makes 747 revolutions per mile (465 revolutions per kilometer).

285/40R18 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 285/40R18 tire can be replaced with 77 compatible tire sizes. Select optional plus size to see its specs.

Tire Size	Overall Diameter	Difference
345/30R18	26.2" (665 mm)	-2.9%
315/25R20	26.2" (666 mm)	-2.8%
225/35R20	26.2" (666 mm)	-2.8%
305/30R19	26.3" (667 mm)	-2.6%
265/30R20	26.3" (668 mm)	-2.5%
265/40R18	26.3" (669 mm)	-2.3%
265/35R19	26.3" (669 mm)	-2.3%
235/45R18	26.3" (669 mm)	-2.3%
325/25R20	26.4" (670 mm)	-2.2%
305/35R18	26.4" (671 mm)	-2%
235/40R19	26.4" (671 mm)	-2%
235/35R20	26.5" (672 mm)	-1.9%
315/30R19	26.5" (673 mm)	-1.8%
215/50R18	26.5" (673 mm)	-1.8%
135/80R18	26.5" (673 mm)	-1.8%
135/70R19	26.5" (673 mm)	-1.8%
275/30R20	26.5" (674 mm)	-1.6%
275/35R19	26.6" (675 mm)	-1.5%
155/70R18	26.6" (675 mm)	-1.5%
335/25R20	26.6" (676 mm)	-1.3%
245/45R18	26.7" (677 mm)	-1.2%
275/40R18	26.7" (677 mm)	-1.2%
315/35R18	26.7" (677 mm)	-1.2%
325/30R19	26.7" (679 mm)	-0.9%
245/40R19	26.7" (679 mm)	-0.9%
345/25R20	26.8" (680 mm)	-0.7%
245/35R20	26.8" (680 mm)	-0.7%
285/30R20	26.8" (680 mm)	-0.7%
145/60R20	26.9" (682 mm)	-0.4%
285/35R19	26.9" (683 mm)	-0.3%
205/55R18	26.9" (683 mm)	-0.3%
225/50R18	26.9" (683 mm)	-0.3%
325/35R18	27" (685 mm)	0%
225/45R19	27" (685 mm)	0%
335/30R19	27" (685 mm)	0%
255/35R20	27" (686 mm)	0.1%
295/30R20	27" (686 mm)	0.1%
255/45R18	27" (687 mm)	0.3%
255/40R19	27" (687 mm)	0.3%
225/40R20	27.1" (688 mm)	0.4%
295/35R19	27.1" (689 mm)	0.6%
165/70R18	27.1" (689 mm)	0.6%
145/80R18	27.1" (689 mm)	0.6%
345/30R19	27.2" (691 mm)	0.9%
305/30R20	27.2" (692 mm)	1%
295/40R18	27.3" (693 mm)	1.2%
215/55R18	27.3" (693 mm)	1.2%
175/60R19	27.3" (693 mm)	1.2%
235/50R18	27.3" (693 mm)	1.2%
265/35R20	27.3" (694 mm)	1.3%
155/60R20	27.3" (694 mm)	1.3%
265/40R19	27.4" (695 mm)	1.5%
265/45R18	27.4" (695 mm)	1.5%
235/45R19	27.4" (695 mm)	1.5%
145/65R20	27.4" (696 mm)	1.6%
235/40R20	27.4" (696 mm)	1.6%
305/35R19	27.4" (697 mm)	1.8%
355/30R19	27.4" (697 mm)	1.8%
315/30R20	27.5" (698 mm)	1.9%
345/35R18	27.5" (699 mm)	2%
175/55R20	27.6" (700 mm)	2.2%
275/35R20	27.6" (700 mm)	2.2%
305/40R18	27.6" (701 mm)	2.3%
155/70R19	27.6" (701 mm)	2.3%
215/45R20	27.6" (702 mm)	2.5%
145/85R18	27.7" (703 mm)	2.6%
315/35R19	27.7" (703 mm)	2.6%
205/60R18	27.7" (703 mm)	2.6%
245/50R18	27.7" (703 mm)	2.6%
275/40R19	27.7" (703 mm)	2.6%
245/45R19	27.7" (703 mm)	2.6%
325/30R20	27.7" (704 mm)	2.8%
195/50R20	27.7" (704 mm)	2.8%
245/40R20	27.7" (704 mm)	2.8%
275/45R18	27.8" (705 mm)	2.9%
225/55R18	27.8" (705 mm)	2.9%
155/80R18	27.8" (705 mm)	2.9%