255/40R20 tires have a diameter of 28.0″, a section width of 10.0″, and a wheel diameter of 20″. The circumference is 88.0″ and they have 720 revolutions per mile.
Generally they are approved to be mounted on 8.5-10″ wide wheels.
255/40R20
Diameter : 28.0″
Width : 10.0″
Wheel : 20″ x 8.5-10″
Sidewall : 4.0″
Circum. : 88.0″
Revs/Mile : 720
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