The 80 tires will be "taller" that the smaller 70 tires.
The first number is the tire width. The second number is the height of the tire as a percentage of the width. R would be a radial tire and the 22.5 is the rim size.
From what I have been reading having a larger tire on the tag than specified would increase the weight on the tag and subsequently move weight off of the drive tandems and on to the front axle.
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Gordon and Janet
Tour 42QD/InTech Stacker
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