225/40R18 Tire Size in Inches

225/40R18 is a metric tire size representation, which defines that the tires have a width of 225 mm, 40 is the aspect ratio and a rim diameter of 18 inches. In the imperial system the tire size 225/40R18 equates to a 25.1×8.9R18 that is commonly used in the automotive industry. So Converting 225/40R18 in inches the tires have a length of 25.1 inches, a width of 8.9 inches, a sidewall height of 3.5 inches and The number of complete resolutions made by the corresponding tire size is equal to 804 per mile with a circumference of 78.8 inches.

225/40R18 tire size in inches

225/40R18inchesmm
Tire Diameter25.1 inches637 mm
Tread Width8.9 inches225 mm
Rim Diameter18 inches457 mm
Sidewall Height3.5 inches90 mm
Circumference78.8 inches2000 mm
Revolutions804 per mile500 per km

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225/40R18 Equivalent Tire Sizes for replacement

If you are replacing your tires, always keep in mind that they are compatible with your vehicle so that the impact on the overall performance of your vehicle can be reduced. Here we have listed some tire size that is equivalent to 225/40R18 tires.

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%

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