305/25R21 In Inches

What size tire is 305/25R21 in Inches?

The 305/25R21 equivalent to 27x12R21 in inches, as follow:

  • 27 inches (686mm) 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
  • 21 inches (533mm) represent the rim diameter or called the wheel diameter that can be mounted on.
InchesMetric
Diameter27"686 mm
Tread Width12"305 mm
Rim Diameter21"533 mm
Sidewall Height3"76 mm
Circumference84.8"2154 mm
Revolutions747"464 mm
tire diameter
12"
27"
Tire Side
Tire Circumference
84.8"
21"
3"
747 Revs/Mile

What is a 305/25R21 tire width?

The 305/25R21 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 tall is a 305/25R21 tire’s height?

The 305/25R21 has an overall diameter of 27 inches or 685 mm tall (measured from the outside edges of the wheel)

What size rim do I need for 305/25R21?

The size rim of a 305/25R21 tire is 21 inches or 533 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 305/25R21 tire sidewall’s height?

The sidewall height of a 305/25R21 is 3 inches or 76 mm tall. It’s measured from the rim to the outer edge of the tire.

What about 305/25R21 tire circumference?

305/25R21 tire has a circumference of 84.8 inches or 2154 mm

How many revolutions for 305/25R21 per mile & kilometer?

The 305/25R21 performs 464 revolutions per kilometer or 747 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 305/25R21 is acceptable?

You can replace the 305/25R21 tires that are within ±3% of the overall tire diameter. In this case, it’s between 26.2 and 27.8 inches (664mm to 706 mm). Check our tire size chart here or the tire size calculator tool here to find your size.


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Tire Size Chart for 21" Wheels:

26″ Tire Diameter

27″ Tire Diameter

28″ Tire Diameter


29″ Tire Diameter

30″ Tire Diameter

31″ Tire Diameter

32″ Tire Diameter


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