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245/40 R21 tire dimensions

Nominal geometric dimensions, calculated from the size marking.

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729.4 mm

Overall diameter · 245/40 R21

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What 245/40 R21 means

Nominal section width245 mm
Sidewall-to-width ratio40%
Sidewall height98 mm
ConstructionR — radial
Wheel bead-seat diameter21 inches
Overall diameter729 mm (28.7 in)
Rolling circumference2291 mm

Load index, speed rating and approved wheel widths must also match the vehicle requirements. Calculated dimensions do not establish a safe replacement size. Actual rolling circumference changes with load, pressure, wear and tire construction.

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Vehicles with 245/40 R21 tires

Configurations in the catalogue recorded with this size. Equipment varies by market and trim.