I probably won't be exceeding the sidewall rating, but I would have no reservations about doing so for several reasons. Oregon has relatively cool temperatures, I don't ever exceed 75mph, and the ratings are conservative figures.
In HS I would over-inflate the bicycle tires on the electric vehicle I made by 10% to give lower rolling resistance. We would distance race against other cars in a closed circuit.
Of course, I'm not an expert and will not be liable for anyone who chooses to over-inflate their tires.
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