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Aren't there a number of different questions on the table?
1) Does the size of a tire's footprint affect grip?
2) Does inflation pressure affect a tire's grip?
These may appear to be the same question, but asked in a different way, but I think you'll find they have some interestingly different aspects that bear exploration.
Lastly,
3) Friction theory: Do tires behave according to classical fiction theory, where F = µN, nad where µ has a lower value for sliding friction than for static friction.
So which question are we trying to answer?
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