205/40R18 in Inches

Tire size 205/40R18 refers to the tire size in numbers and letters such as the first number “205” indicates the tire width in millimeters, the second number “40” indicates the aspect ratio of the tire and the last number indicates the diameter of the tire. A 205/40R18 tire in inches can be described as a tire with a width of about 8.1 inches, a sidewall height of about 3.2 inches, and it fits on a 18-inch wheel.

Converting 205/40R18 in Inches

205/40R18 inches mm
Tire Diameter 24.4 inches 621 mm
Tread Width 8.1 inches 205 mm
Rim Diameter 18 inches 457 mm
Sidewall Height 3.2 inches 82 mm
Circumference 76.6 inches 1950 mm
Revolutions 827 per mile 513 per km

Tire Size Calculator

The Tire Size Calculator is a convenient online tool that helps determine the correct tire dimensions for a vehicle, ensuring optimal performance and compatibility.

Tire Diameter
Tread Width
Rim Diameter
Sidewall Height
Circumference
Revolutions

205/40R18 Alternate Tire Size

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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