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305/30 R20 tire dimensions

Nominal geometric dimensions, calculated from the size marking.

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691.0 mm

Overall diameter · 305/30 R20

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What 305/30 R20 means

Nominal section width305 mm
Sidewall-to-width ratio30%
Sidewall height92 mm
ConstructionR — radial
Wheel bead-seat diameter20 inches
Overall diameter691 mm (27.2 in)
Rolling circumference2171 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 305/30 R20 tires

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