155/90R18 tire size in inches

155/90R18 tires are 29.0″ tall, have a section width of 6.1″, and fit wheels with a diameter of 18. The circumference is 91.0″ that translates into 696 revolutions per mile. As a rule, they can be mounted on the wheels with 18″ rim width. In the high flotation system, the equivalent tire size is 29X6.1R18.

What is 155/90R18 in inches?

Tire Diameter:29.0″
Tire Section Width:6.1″
Rim Width Range:18″
Sidewall Height:5.5″

Alternate sizes – Upsizing Wheels or Tires?

What is a 155/90R18 equivalent to?

Check out the chart below to find possible alternatives to the 155/90R18 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 sizeDiameterDifferenceWidthWheel size
Upsizing chart

What does 155/90R18 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 LTThe first letter in the string denotes the class. P stands for passenger vehicles, LT is intended for light trucks carrying heavy loads.
155It means the width of the tire is 155 millimeters
90The tire has an aspect ratio of 90. To put it simple, the sidewall height is 90% of the width, so it would be 5.5″.
RR stands for the Radial, a standard construction method for about 99% of tires.
18The tire is designed to fit 18″ rims that are 18 inches in diameter.

Popular questions about 155/90R18 tire size

How wide is a 155/90R18 tire?

The tires of the given size have a section width of 6.1″ inches.

How tall is a 155/90R18 tire?

The height of the following tire size equals 29.0″ inches.

What rims will fit 155/90R18 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″ for 155/90R18 tires.

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