Tire Size Calculator
Calculate tire sizes in inches or millimeters and find alternative sizes.
Inches
Millimeters
Results for 325/25R21 Tires
Diameter
27.4"
Width
12.8"
Sidewall
3.2"
Circumference
86"
Revs per mile
736
Alternate Tire Sizes
21"
14"
15"
16"
17"
18"
19"
20"
22"
Tire Size
Diameter
Width
Sidewall
Circumference
Revs per mile