Decoded notation
245 mm / 55% / R / 18 in
Popular Tire Sizes
245/55R18 Tire Size — Dimensions & Revs
Decode 245/55R18 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width245 mm
Sidewall height134.8 mm
Rim diameter18 in
Overall diameter726.7 mm
Overall diameter28.61 in
Circumference2283.0 mm
Revolutions per mile704.9
Revolutions per km438.0