225/45R18 tires have a diameter of 26.0", a section width of 8.86", and a wheel diameter of 18". The circumference is 81.6 inches and the revolutions per mile are 776. Specs vary by manufacturer.
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Diameter : 26.0"
Width : 8.86"
Wheel : 18"
Circumference : 81.6"
Revs/Mile : 776
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