Decoded notation
225 mm / 45% / R / 18 in
Popular Tire Sizes
225/45R18 Tire Size — Dimensions & Revs
Decode 225/45R18 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width225 mm
Sidewall height101.3 mm
Rim diameter18 in
Overall diameter659.7 mm
Overall diameter25.97 in
Circumference2072.5 mm
Revolutions per mile776.5
Revolutions per km482.5