325/25R21 in inches

How tall is a 325 25R21 tire?

When converted to inches, the equivalent of a 325/25R21 tire size is 27.4x12.8R21. It means that:

  • height overall (or diameter) is 27.4 inches
  • tread width is 12.8 inches
  • wheel diameter is 21 inches

Learn more

325/25R21 tire size in inches
325/25R21 tire size chart

325/25R21 tire size in inches

325/25R21 Height / overall diameter: 27.4 inches
Height / overall diameter
27.4 inches
325/25R21 Tread width: 12.8 inches
Tread width
12.8 inches
325/25R21 Sidewall: 3.2 inches
Sidewall
3.2 inches
325/25R21 Wheel diameter: 21 inches
Wheel diameter
21 inches
325/25R21 Circumference: 86 inches
Circumference
86 inches
325/25R21 Revolutions: 737 per mile
Revolutions
737 per mile

325/25R21 — what does it mean?

  • 325 stands for tread width in millimeters
  • 25 is an aspect ration between the tread width and the sidewall in percents
  • R means that the tire has a radial construction
  • 21 is a wheel diameter (or rim) in inches

325/25R21 tire code
325/25R21 tire code

How to convert 325 25R21 to inches?

First of all, we need to divide 325 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 12.8″. Then, 25% of the 12.8″ will result in 3.2″ sidewall.

To get the total height or tire diameter, we need to sum the 21″ rim diameter with two of the sidewall heights. It will result in a 27.4″ total tire diameter (or height).

For your convenience, below is a table for 325/25R21 conversion to inches:

Inches Metric
Overall diameter (height) 27.4″ 696 mm
Tread width 12.8″ 325 mm
Wheel diameter 21″ 696 mm
Sidewall height 3.2″ 81 mm
Circumference 86″ 2185 mm
Revolutions 737 / ml 458 / km

Alternatives to a 325/25R21 tire

If you're looking to upsize your 325 25R21 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
235/35R21 27.4″ 0% 9.3″ 21″
245/30R21 26.8″ -0.54% 9.6″ 21″
245/35R21 27.8″ 0.36% 9.6″ 21″
255/30R21 27″ -0.36% 10″ 21″
255/35R21 28″ 0.53% 10″ 21″
265/30R21 27.2″ -0.18% 10.4″ 21″
275/30R21 27.6″ 0.18% 10.8″ 21″
285/30R21 27.8″ 0.36% 11.2″ 21″
295/25R21 26.8″ -0.54% 11.6″ 21″
295/30R21 28″ 0.53% 11.6″ 21″