Decoded notation
255 mm / 55% / R / 20 in
Popular Tire Sizes
255/55R20 Tire Size — Dimensions & Revs
Decode 255/55R20 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width255 mm
Sidewall height140.3 mm
Rim diameter20 in
Overall diameter788.5 mm
Overall diameter31.04 in
Circumference2477.1 mm
Revolutions per mile649.7
Revolutions per km403.7