 Schlegel Farms, Hagerstown Indiana | You might gain a little with a 20.8 X 34.
There are charts that show the rolling radius for various tires on-line.
Also the narrower rim (16"vs 18"??) for the 18.4 would pinch the 20.8 up some.
And, there might be a difference in the height from one brand to another. I know that years ago a Firestone 30.5 was shorter than BF Goodrich.
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