Tire Size Calculator
Calculate tire sizes in inches or millimeters and find alternative sizes.
Inches
Millimeters
Results for 305/65R18 Tires
Diameter
33.6"
Width
12"
Sidewall
7.8"
Circumference
105.5"
Revs per mile
600
Alternate Tire Sizes
18"
16"
17"
20"
22"
24"
26"
28"
Tire Size
Diameter
Width
Sidewall
Circumference
Revs per mile