Decoded notation
245 mm / 40% / R / 18 in
Popular Tire Sizes
245/40R18 Tire Size — Dimensions & Revs
Decode 245/40R18 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width245 mm
Sidewall height98.0 mm
Rim diameter18 in
Overall diameter653.2 mm
Overall diameter25.72 in
Circumference2052.1 mm
Revolutions per mile784.2
Revolutions per km487.3