205/40R18 In Inches

What size tire is 205/40R18 in Inches?

The 205/40R18 equivalent to 24.4x8.1R18 in inches, as follow:

  • 24.4 inches (621mm) stand for the tire diameter, also referred to as the tire height
  • 8.1 inches (205mm) is the tire width, this may also know as the section width
  • 18 inches (457mm) represent the rim diameter or called the wheel diameter that can be mounted on.
Diameter24.4"621 mm
Tread Width8.1"205 mm
Rim Diameter18"457 mm
Sidewall Height3.2"82 mm
Circumference76.7"1948 mm
Revolutions826"513 mm
tire diameter
Tire Side
Tire Circumference
826 Revs/Mile

What is a 205/40R18 tire width?

The 205/40R18 has a width of 8.1 inches or 205 mm wide. This is the measurement of the tire at its thickest point, the distance between the inner sidewall’s widest point and the outer sidewall’s widest point. This physical width of the tire can change if the tire is mounted on a wheel slightly wider or narrower than the size indicated by the rim width.

How tall is a 205/40R18 tire’s height?

The 205/40R18 has an overall diameter of 24.4 inches or 621 mm tall (measured from the outside edges of the wheel)

What size rim do I need for 205/40R18?

The size rim of a 205/40R18 tire is 18 inches or 457 mm tall. This number represents the distance between the two bead seat areas where the tire is sealed onto the wheel.

How tall is a 205/40R18 tire sidewall’s height?

The sidewall height of a 205/40R18 is 2.8 inches or 82 mm tall. It’s measured from the wheel rim to the top of the tread, expressed as a percentage of tire width.

What about 205/40R18 tire circumference?

205/40R18 tire has a circumference of 76.7 inches or 1948 mm

How many revolutions for 205/40R18 per mile & kilometer?

The 205/40R18 performs 513 revolutions per kilometer or 826 revolutions per mile. Revolutions per mile indicate the number of times a tire revolves while it covers the distance of one mile/kilometer

What’s wider or narrow than 205/40R18 is acceptable?

You can replace the 205/40R18 tires that are within ±3% of the overall tire diameter. In this case, it’s between 23.7 and 25.1 inches (602mm to 640 mm). Check our tire size chart here or the tire size calculator tool here to find your size.

Tire Size Chart for 18" Wheels:

23″ Tire Diameter

24″ Tire Diameter

25″ Tire Diameter

26″ Tire Diameter

27″ Tire Diameter

28″ Tire Diameter

29″ Tire Diameter

30″ Tire Diameter

31″ Tire Diameter

32″ Tire Diameter

33″ Tire Diameter

34″ Tire Diameter

35″ Tire Diameter

36″ Tire Diameter

38″ Tire Diameter

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