Decoded notation
285 mm / 50% / R / 21 in
Popular Tire Sizes
285/50R21 Tire Size — Dimensions & Revs
Decode 285/50R21 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 height142.5 mm
Rim diameter21 in
Overall diameter818.4 mm
Overall diameter32.22 in
Circumference2571.1 mm
Revolutions per mile625.9
Revolutions per km388.9