225/40R18 Tires

225/40R18 Conversion

When converted to inches, 225/40R18 is equivalent to 25.1x8.9R18.

225/40R18 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 3.5 inches (90 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 25.1 inches (637 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 78.8 inches (2000.2 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. 225/40R18 tire makes 804 revolutions per mile (500 revolutions per kilometer).

225/40R18 Section Width
8.9"
25.1"
225/40R18 Tire Side
Tire Circumference
78.8"
18"
3.5"
804 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 637 mm 25.1"
Tread Width 225 mm 8.9"
Rim Diameter 457.2 mm 18"
Sidewall Height 90 mm 3.5"
Circumference 2000.2 mm 78.8"
Revolutions 500 per km 804 per mile

225/40R18 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 225/40R18 tire can be replaced with 45 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
135/60R18 24.4" (619 mm) -2.8%
225/30R19 24.4" (619 mm) -2.8%
235/35R18 24.4" (621 mm) -2.5%
205/40R18 24.4" (621 mm) -2.5%
235/30R19 24.6" (625 mm) -1.9%
245/35R18 24.8" (629 mm) -1.3%
285/30R18 24.8" (629 mm) -1.3%
215/40R18 24.8" (629 mm) -1.3%
295/25R19 24.8" (631 mm) -0.9%
245/30R19 24.8" (631 mm) -0.9%
215/35R19 24.9" (633 mm) -0.6%
125/70R18 24.9" (633 mm) -0.6%
305/25R19 25" (635 mm) -0.3%
255/35R18 25" (635 mm) -0.3%
295/30R18 25" (635 mm) -0.3%
255/30R19 25.1" (637 mm) 0%
215/30R20 25.1" (638 mm) 0.2%
225/35R19 25.2" (641 mm) 0.6%
305/30R18 25.2" (641 mm) 0.6%
205/45R18 25.2" (641 mm) 0.6%
315/25R19 25.2" (641 mm) 0.6%
265/35R18 25.3" (643 mm) 0.9%
265/30R19 25.3" (643 mm) 0.9%
155/60R18 25.3" (643 mm) 0.9%
225/30R20 25.4" (644 mm) 1.1%
115/70R19 25.4" (645 mm) 1.3%
135/60R19 25.4" (645 mm) 1.3%
145/65R18 25.4" (645 mm) 1.3%
235/40R18 25.4" (645 mm) 1.3%
275/25R20 25.4" (646 mm) 1.4%
235/35R19 25.5" (647 mm) 1.6%
315/30R18 25.5" (647 mm) 1.6%
135/70R18 25.5" (647 mm) 1.6%
275/30R19 25.6" (649 mm) 1.9%
275/35R18 25.6" (649 mm) 1.9%
235/30R20 25.6" (650 mm) 2%
285/25R20 25.6" (650 mm) 2%
335/25R19 25.6" (651 mm) 2.2%
215/45R18 25.6" (651 mm) 2.2%
245/40R18 25.7" (653 mm) 2.5%
215/40R19 25.8" (655 mm) 2.8%
285/30R19 25.8" (655 mm) 2.8%
245/35R19 25.8" (655 mm) 2.8%
295/25R20 25.8" (656 mm) 3%
245/30R20 25.8" (656 mm) 3%