Decoded notation
285 mm / 55% / R / 20 in
Popular Tire Sizes
285/55R20 Tire Size — Dimensions & Revs
Decode 285/55R20 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width285 mm
Sidewall height156.8 mm
Rim diameter20 in
Overall diameter821.5 mm
Overall diameter32.34 in
Circumference2580.8 mm
Revolutions per mile623.6
Revolutions per km387.5