Decoded notation
255 mm / 45% / R / 18 in
Popular Tire Sizes
255/45R18 Tire Size — Dimensions & Revs
Decode 255/45R18 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 height114.8 mm
Rim diameter18 in
Overall diameter686.7 mm
Overall diameter27.04 in
Circumference2157.3 mm
Revolutions per mile746.0
Revolutions per km463.5