165/40R18 In Inches

What size tire is 165/40R18 in Inches?

The 165/40R18 equivalent to 23.2x6.5R18 in inches, as follow:

  • 23.2 inches (589mm) stand for the tire diameter, also referred to as the tire height
  • 6.5 inches (165mm) 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.
InchesMetric
Diameter23.2"589 mm
Tread Width6.5"165 mm
Rim Diameter18"457 mm
Sidewall Height2.6"66 mm
Circumference72.9"1852 mm
Revolutions869"540 mm
tire diameter
6.5"
23.2"
Tire Side
Tire Circumference
72.9"
18"
2.6"
869 Revs/Mile

How tall is a 165/40R18 tire’s height?

The 165/40R18 has an overall diameter of 23.2 inches or 589 mm tall (measured from the outside edges of the wheel)

How wide is a 165/40R18 tire’s width?

The 165/40R18 has a width of 6.5 inches or 165 mm wide. This is the measurement of the tire at its thickest point, the distance between the outer sidewall’s widest point and the inner 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.

What is a 165/40R18 tire sidewall height?

The 165/40R18 has a sidewall height of 2.6 inches or 66 mm tall. It’s measured from the rim to the outer edge of the tire.

What size rim do you need for 165/40R18?

The 165/40R18 tire has a size rim of 18 inches or 457 mm. This number represents the distance between the two bead seat areas where the tire is sealed onto the wheel.

How many revolutions for 165/40R18 per mile or kilometer?

The 165/40R18 performs 869 revolutions per mile or 540 revolutions per kilometer. Revolutions per mile indicate the number of times a tire revolves while it covers the distance of one mile/kilometer

How about 165/40R18 tire circumference?

The circumference of 165/40R18 is 72.9 inches or 1852 mm.

What’s wider or narrow than 165/40R18 is acceptable?

You can replace the 165/40R18 tires that are within ±3% of the overall tire diameter. In this case, it’s between 22.5 and 23.9 inches (571mm to 607 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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