255/40R18 tires have a diameter of 26.0″, a section width of 10.0″, and a wheel diameter of 18″. The circumference is 81.7″ and they have 775 revolutions per mile.
Generally they are approved to be mounted on 8.5-10″ wide wheels.
255/40R18
Diameter : 26.0″
Width : 10.0″
Wheel : 18″ x 8.5-10″
Sidewall : 4.0″
Circum. : 81.7″
Revs/Mile : 775
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