Decoded notation
235 mm / 30% / R / 18 in
Popular Tire Sizes
235/30R18 Tire Size — Dimensions & Revs
Decode 235/30R18 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width235 mm
Sidewall height70.5 mm
Rim diameter18 in
Overall diameter598.2 mm
Overall diameter23.55 in
Circumference1879.3 mm
Revolutions per mile856.4
Revolutions per km532.1