305/30R21 In Inches

What size tire is 305/30R21 in Inches?

The 305/30R21 equivalent to 28.2x12R21 in inches, as follow:

  • 28.2 inches (716mm) 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.
Diameter28.2"716 mm
Tread Width12"305 mm
Rim Diameter21"533 mm
Sidewall Height3.6"92 mm
Circumference88.6"2250 mm
Revolutions715"444 mm
tire diameter
Tire Side
Tire Circumference
715 Revs/Mile

How big is a 305/30R21 tire’s height?

The overall diameter of a 305/30R21 is 28.2 inches or 717 mm tall (measurement of a tire’s outside diameter through its exact center when inflated with no load.

How wide is a 305/30R21 tire’s width?

The 305/30R21 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 305/30R21 tire sidewall height?

The 305/30R21 has a sidewall height of 3.6 inches or 92 mm tall. It’s measured from the rim to the outer edge of the tire.

What size rim do you need for 305/30R21?

The 305/30R21 tire has a size rim of 21 inches or 533 mm. This number represents the distance between the two bead seat areas where the tire is sealed onto the wheel.

How many revolutions for 305/30R21 per mile or kilometer?

The 305/30R21 performs 715 revolutions per mile or 444 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 305/30R21 tire circumference?

The circumference of 305/30R21 is 88.6 inches or 2250 mm.

What’s wider or narrow than 305/30R21 is acceptable?

You can replace the 305/30R21 tires that are within ±3% of the overall tire diameter. In this case, it’s between 27.4 and 29 inches (695mm to 739 mm). Check our tire size chart here or the tire size calculator tool here to find your size.

Share on:

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

Leave a Comment