Decoded notation
285 mm / 50% / R / 18 in
Popular Tire Sizes
285/50R18 Tire Size — Dimensions & Revs
Decode 285/50R18 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 height142.5 mm
Rim diameter18 in
Overall diameter742.2 mm
Overall diameter29.22 in
Circumference2331.7 mm
Revolutions per mile690.2
Revolutions per km428.9