205/40R18 Tire Size in Inches

205/40R18 is a metric tire size representation, which defines that the tires have a width of 205 mm, 40 is the aspect ratio and a rim diameter of 18 inches. In the imperial system the tire size 205/40R18 equates to a 24.4×8.1R18 that is commonly used in the automotive industry. So Converting 205/40R18 in inches the tires have a length of 24.4 inches, a width of 8.1 inches, a sidewall height of 3.2 inches and The number of complete resolutions made by the corresponding tire size is equal to 827 per mile with a circumference of 76.6 inches.

205/40R18 tire size in inches

205/40R18inchesmm
Tire Diameter24.4 inches621 mm
Tread Width8.1 inches205 mm
Rim Diameter18 inches457 mm
Sidewall Height3.2 inches82 mm
Circumference76.6 inches1950 mm
Revolutions827 per mile513 per km

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205/40R18 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 205/40R18 tires.

Tire Size Overall Diameter Difference
245/30R18 23.8″ (605 mm) -2.6%
125/60R18 23.9″ (607 mm) -2.3%
215/35R18 23.9″ (607 mm) -2.3%
255/30R18 24.1″ (611 mm) -1.6%
175/45R18 24.2″ (615 mm) -1%
225/35R18 24.2″ (615 mm) -1%
265/30R18 24.3″ (617 mm) -0.6%
135/60R18 24.4″ (619 mm) -0.3%
225/30R19 24.4″ (619 mm) -0.3%
235/35R18 24.4″ (621 mm) 0%
235/30R19 24.6″ (625 mm) 0.6%
285/30R18 24.8″ (629 mm) 1.3%
245/35R18 24.8″ (629 mm) 1.3%
215/40R18 24.8″ (629 mm) 1.3%
245/30R19 24.8″ (631 mm) 1.6%
295/25R19 24.8″ (631 mm) 1.6%
215/35R19 24.9″ (633 mm) 1.9%
125/70R18 24.9″ (633 mm) 1.9%
295/30R18 25″ (635 mm) 2.3%
255/35R18 25″ (635 mm) 2.3%
305/25R19 25″ (635 mm) 2.3%
255/30R19 25.1″ (637 mm) 2.6%
225/40R18 25.1″ (637 mm) 2.6%
215/30R20 25.1″ (638 mm) 2.7%

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