305/55R20 In Inches

What size tire is 305/55R20 in Inches?

The 305/55R20 equivalent to 33.2x12R20 in inches, as follow:

  • 33.2 inches (844mm) 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
  • 20 inches (508mm) represent the rim diameter or called the wheel diameter that can be mounted on.
InchesMetric
Diameter33.2"844 mm
Tread Width12"305 mm
Rim Diameter20"508 mm
Sidewall Height6.6"168 mm
Circumference104.3"2649 mm
Revolutions608"378 mm
tire diameter
12"
33.2"
Tire Side
Tire Circumference
104.3"
20"
6.6"
608 Revs/Mile

What is 305/55R20 tire diameter?

The 305/55R20 has an overall diameter of 33.2 inches or 844 mm tall (Measurement of a tire’s outside diameter through its exact center when inflated with no load.)

How wide is a 305/55R20 tire’s width?

The 305/55R20 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 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 305/55R20 tire sidewall height?

The 305/55R20 has a sidewall height of 6.6 inches or 168 mm tall. It’s measured from the rim to the outer edge of the tire.

What size rim do you need for 305/55R20?

The 305/55R20 tire has a size rim of 20 inches or 508 mm. This number represents the distance between the two bead seat areas where the tire is sealed onto the wheel.

How many revolutions for 305/55R20 per mile or kilometer?

The 305/55R20 performs 608 revolutions per mile or 378 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 305/55R20 tire circumference?

The circumference of 305/55R20 is 104.3 inches or 2649 mm.

What’s wider or narrow than 305/55R20 is acceptable?

You can replace the 305/55R20 tires that are within ±3% of the overall tire diameter. In this case, it’s between 32.2 and 34.2 inches (819mm to 869 mm). Check our tire size chart here or the tire size calculator tool here to find your size.


Tire Size Chart for 20" Wheels:

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

37″ Tire Diameter

39″ Tire Diameter


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