225/40R18 tires are 25.1″ tall, have a section width of 8.9″, and fit wheels with a diameter of 18. The circumference is 78.8″ that translates into 804 revolutions per mile. As a rule, they can be mounted on the wheels with 18″ x 7.5-9″ rim width. In the high flotation system, the equivalent tire size is 25.1×8.9R18.
What is 225/40R18 in inches?
|Tire Section Width:||8.9″|
|Rim Width Range:||18″ x 7.5-9″|
Alternate sizes – Upsizing Wheels or Tires?
What is a 225/40R18 equivalent to?
Check out the chart below to find possible alternatives to the 225/40R18 tire size staying within the 3%-range of the tire diameter, allowing to choose wider wheels or tires with smaller sidewalls. A good rule of thumb is to avoid decreasing the diameter of the wheel. If you are not sure about the custom sizes, consult the experts or stick to the factory tire size.
|Tire size||Diameter||Difference||Width||Wheel size|
What does 225/40R18 mean?
Trying to decode the size of the tires? Scroll down the page to learn what all these numbers on the sidewall stand for.
|P or LT||The first letter in the string denotes the class. P stands for passenger vehicles, LT is intended for light trucks carrying heavy loads.|
|225||It means the width of the tire is 225 millimeters|
|40||The tire has an aspect ratio of 40. To put it simple, the sidewall height is 40% of the width, so it would be 3.5″.|
|R||R stands for the Radial, a standard construction method for about 99% of tires.|
|18||The tire is designed to fit 18″ x 7.5-9″ rims that are 18 inches in diameter.|
Popular questions about 225/40R18 tire size
How wide is a 225/40R18 tire?
The tires of the given size have a section width of 8.9″ inches.
How tall is a 225/40R18 tire?
The height of the following tire size equals 25.1″ inches.
What rims will fit 225/40R18 tires?
For each tire size, often there are several wheel sizes. You can’t put very wide tires on narrow rims or vise versa. You need the rim size of 18″ x 7.5-9″ for 225/40R18 tires.