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First, I think you'll find that the indirect TPMS only needed to trigger an alert at 25% underinflated. In the case of 30 psi, 25% under would be 23 psi.
I think you'll also find that increasing inflation pressure increases the diameter - and that the effect diminishes as the pressure goes up.
Put another way, the difference in diameter between 30 psi and 23 psi (7 psi) is greater than the difference between 42 and 35 psi (also 7 psi).
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