305/55R20 tires have a diameter of 33.2″, a section width of 12.0″, and a wheel diameter of 20″. The circumference is 104.3″ and they have 608 revolutions per mile.
Generally they are approved to be mounted on 8.5-11″ wide wheels.
305/55R20
Diameter : 33.2″
Width : 12.0″
Wheel : 20″ x 8.5-11″
Sidewall : 6.6″
Circum. : 104.3″
Revs/Mile : 608
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