Tire Size Calculator
Calculate tire sizes in inches or millimeters and find alternative sizes.
Inches
Millimeters
Results for 285/55R20 Tires
Diameter
32.3"
Width
11.2"
Sidewall
6.2"
Circumference
101.6"
Revs per mile
624
Alternate Tire Sizes
20"
16"
17"
18"
19"
21"
22"
23"
24"
26"
Tire Size
Diameter
Width
Sidewall
Circumference
Revs per mile