305/30R18 In Inches

What size tire is 305/30R18 in Inches?

The 305/30R18 equivalent to 25.2x12R18 in inches, as follow:

  • 25.2 inches (640mm) stand for the tire diameter, also referred to as the tire height
  • 12 inches (305mm) 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
Tire Diameter25.2"640 mm
Tread Width12"305 mm
Rim Diameter18"457 mm
Sidewall Height3.6"92 mm
Circumference79.2"2012 mm
Revolutions800 revs/mile497 revs/km
tire diameter
12"
25.2"
Tire Side
Tire Circumference
79.2"
18"
3.6"
800 Revs/Mile

What is a 305/30R18 tire width?

The 305/30R18 has a width of 12 inches or 305 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 big is a 305/30R18 tire’s height?

The overall diameter of a 305/30R18 is 25.2 inches or 641 mm tall (measurement of a tire’s outside diameter through its exact center when inflated with no load.

What size rim do I need for 305/30R18?

The size rim of a 305/30R18 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 305/30R18 tire sidewall’s height?

The sidewall height of a 305/30R18 is 3.6 inches or 92 mm tall. It’s measured from the rim to the outer edge of the tire.

What about 305/30R18 tire circumference?

305/30R18 tire has a circumference of 79.2 inches or 2012 mm

How many revolutions for 305/30R18 per mile & kilometer?

The 305/30R18 performs 497 revolutions per kilometer or 800 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 305/30R18 is acceptable?

You can replace the 305/30R18 tires that are within ±3% of the overall tire diameter. In this case, it’s between 24.4 and 26 inches (622mm to 660 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


*Disclaimer: The information provided on the tire size is for general informational purposes only. We recommend that you consult a certified tire specialist or National Highway Traffic Safety Administration (NHTSA) sets specific guidelines for tires used on vehicles.


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Jamie Hicks

Sullivan Kane

Tire Technician at TireSizesCalculator

Sullivan is a Tire Technician specializing in tire repair at TireSizesCalculator. With over 6 years of experience in the industry, Sullivan has become an expert in tire repair, maintenance & installation.


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