Decoded notation
225 mm / 30% / R / 18 in
Popular Tire Sizes
225/30R18 Tire Size — Dimensions & Revs
Decode 225/30R18 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 height67.5 mm
Rim diameter18 in
Overall diameter592.2 mm
Overall diameter23.31 in
Circumference1860.5 mm
Revolutions per mile865.0
Revolutions per km537.5