Decoded notation
275 mm / 45% / R / 21 in
Popular Tire Sizes
275/45R21 Tire Size — Dimensions & Revs
Decode 275/45R21 and calculate nominal width, sidewall, overall diameter, circumference and revolutions.
Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary.
Width275 mm
Sidewall height123.8 mm
Rim diameter21 in
Overall diameter780.9 mm
Overall diameter30.74 in
Circumference2453.3 mm
Revolutions per mile656.0
Revolutions per km407.6