285/55R20 Tire Size Specifications & Compatible Vehicles
Overall Diameter
821.5 mm
Section Width
285 mm
Sidewall Height
156.8 mm
Circumference
2580.8 mm
Revs/Mile
624
Rim Diameter
20"
Inch Equivalent
32.3x11.2R20
Rim Width (ETRTO)
8.5" – 11.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 285/55R20 and may be used as replacements:
Popular Comparisons
See how 285/55R20 compares to other common tire sizes:
Understanding 285/55R20
The tire size 285/55R20 means the tire has a section width of 285mm, an aspect ratio of 55% (the sidewall height is 55% of the width), and fits a 20-inch rim.
Sidewall Height = 285 x 0.55 = 156.8 mm
Overall Diameter = (156.8 x 2) + (20 x 25.4) = 821.5 mm
Circumference = 821.5 x π = 2580.8 mm
Overall Diameter = (156.8 x 2) + (20 x 25.4) = 821.5 mm
Circumference = 821.5 x π = 2580.8 mm
Frequently Asked Questions
The 285/55R20 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 285/55R20 tire has an overall diameter of 821.5mm (32.3 inches). The sidewall height is 156.8mm, and the total circumference is 2581mm.
For 285/55R20 tires, the ETRTO recommended rim width is 9.5". The acceptable range is 8.5" minimum to 11.0" maximum. Using a rim outside this range can cause improper bead seating and unsafe handling.
Yes, as long as the replacement tire overall diameter is within 3% of the 285/55R20 821.5mm diameter. Compatible alternatives include 175/75R22, 155/85R22, 185/85R20. Use our Tire Size Calculator to compare any two sizes.