Decoded notation
255 mm / 65% / R / 18 in
Popular Tire Sizes
255/65R18 Tire Size — Dimensions & Revs
Decode 255/65R18 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 height165.8 mm
Rim diameter18 in
Overall diameter788.7 mm
Overall diameter31.05 in
Circumference2477.8 mm
Revolutions per mile649.5
Revolutions per km403.6