Decoded notation
285 mm / 40% / R / 21 in
Popular Tire Sizes
285/40R21 Tire Size — Dimensions & Revs
Decode 285/40R21 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width285 mm
Sidewall height114.0 mm
Rim diameter21 in
Overall diameter761.4 mm
Overall diameter29.98 in
Circumference2392.0 mm
Revolutions per mile672.8
Revolutions per km418.1