Enough with the theories, this is credible evidence. You may need to zoom in to read the graphs. Press CTRL and the + button to zoom in, and CTRL and - key to zoom out.
Barry's Tire Tech
I'll highlight a few important points.
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I hope you noticed how flat the wear index is for the radial tire. I interpret this to mean that conducting a "chalk test" is not a good way to determine what the best pressure is for wear. Put another way - Radial tires are pretty insensitive to pressure when it comes to wear pattern.
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The first parameter they looked at was cornering coefficient - and all that yielded was that increasing pressure resulted in a quicker responding tire
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Braking Traction: Dry traction is unaffected by inflation pressure, and while wet traction is improved, the effect is small.
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Dynamic Bruise: More pressure is worse.
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