Decoded notation
225 mm / 55% / R / 18 in
Popular Tire Sizes
225/55R18 Tire Size — Dimensions & Revs
Decode 225/55R18 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width225 mm
Sidewall height123.8 mm
Rim diameter18 in
Overall diameter704.7 mm
Overall diameter27.74 in
Circumference2213.9 mm
Revolutions per mile726.9
Revolutions per km451.7