225/40R18 in Inches

Tire size 225/40R18 refers to the tire size in numbers and letters such as the first number “225” 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 225/40R18 tire in inches can be described as a tire with a width of about 8.9 inches, a sidewall height of about 3.5 inches, and it fits on a 18-inch wheel.

Converting 225/40R18 in Inches

225/40R18 inches mm
Tire Diameter 25.1 inches 637 mm
Tread Width 8.9 inches 225 mm
Rim Diameter 18 inches 457 mm
Sidewall Height 3.5 inches 90 mm
Circumference 78.8 inches 2000 mm
Revolutions 804 per mile 500 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

225/40R18 Alternate Tire Size

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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