Quote:
It doesn't explain "artificial downforce" as I see it. It must be me. 
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I now understand my misunderstanding.
Downforce: How much does the vehicle weigh? How much of that is on the rear wheers? All of it, if the fronts aren't on the ground?
So the side-wall flex shrinks the rolling radius by 2-3 inches. You can work it out in pound-feet of downward force [requires G].