Decoded notation
275 mm / 40% / R / 18 in
Popular Tire Sizes
275/40R18 Tire Size — Dimensions & Revs
Decode 275/40R18 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width275 mm
Sidewall height110.0 mm
Rim diameter18 in
Overall diameter677.2 mm
Overall diameter26.66 in
Circumference2127.5 mm
Revolutions per mile756.5
Revolutions per km470.0