Decoded notation
285 mm / 45% / R / 21 in
Popular Tire Sizes
285/45R21 Tire Size — Dimensions & Revs
Decode 285/45R21 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 height128.3 mm
Rim diameter21 in
Overall diameter789.9 mm
Overall diameter31.10 in
Circumference2481.5 mm
Revolutions per mile648.5
Revolutions per km403.0