Decoded notation
275 mm / 55% / R / 18 in
Popular Tire Sizes
275/55R18 Tire Size — Dimensions & Revs
Decode 275/55R18 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 height151.3 mm
Rim diameter18 in
Overall diameter759.7 mm
Overall diameter29.91 in
Circumference2386.7 mm
Revolutions per mile674.3
Revolutions per km419.0