Decoded notation
255 mm / 40% / R / 17 in
Popular Tire Sizes
255/40R17 Tire Size — Dimensions & Revs
Decode 255/40R17 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 height102.0 mm
Rim diameter17 in
Overall diameter635.8 mm
Overall diameter25.03 in
Circumference1997.4 mm
Revolutions per mile805.7
Revolutions per km500.6