Tire Size Calculator
Calculate tire sizes in inches or millimeters and find alternative sizes.
Inches
Millimeters
Results for 225/75R18 Tires
Diameter
31.3"
Width
8.9"
Sidewall
6.6"
Circumference
98.2"
Revs per mile
645
Alternate Tire Sizes
18"
15"
16"
17"
19"
20"
21"
22"
23"
24"
Tire Size
Diameter
Width
Sidewall
Circumference
Revs per mile