Decoded notation
275 mm / 50% / R / 21 in
Popular Tire Sizes
275/50R21 Tire Size — Dimensions & Revs
Decode 275/50R21 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width275 mm
Sidewall height137.5 mm
Rim diameter21 in
Overall diameter808.4 mm
Overall diameter31.83 in
Circumference2539.7 mm
Revolutions per mile633.7
Revolutions per km393.8