Decoded notation
275 mm / 40% / R / 21 in
Popular Tire Sizes
275/40R21 Tire Size — Dimensions & Revs
Decode 275/40R21 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width275 mm
Sidewall height110.0 mm
Rim diameter21 in
Overall diameter753.4 mm
Overall diameter29.66 in
Circumference2366.9 mm
Revolutions per mile679.9
Revolutions per km422.5