Decoded notation
235 mm / 40% / R / 18 in
Popular Tire Sizes
235/40R18 Tire Size — Dimensions & Revs
Decode 235/40R18 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 height94.0 mm
Rim diameter18 in
Overall diameter645.2 mm
Overall diameter25.40 in
Circumference2027.0 mm
Revolutions per mile794.0
Revolutions per km493.4