Decoded notation
285 mm / 55% / R / 18 in
Popular Tire Sizes
285/55R18 Tire Size — Dimensions & Revs
Decode 285/55R18 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 diameter18 in
Overall diameter770.7 mm
Overall diameter30.34 in
Circumference2421.2 mm
Revolutions per mile664.7
Revolutions per km413.0