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Thoughts on tire pressure vs. tire diameter
...or more specifically, tire pressure vs. under axle radius.
My '07 Matrix has the last of the ABS based TPMS, before the EPA mandated pressure sensors. If it sees one wheel spinning slightly faster than the others, it triggers the low pressure warning. The tire pressure is supposed to be 30 psi all around, and the TPMS is sensitive enough to catch a tire that is only 2 psi below the other tires.
Lately I have been running at 42 psi all around. Max is 44 psi for these tires. I have one leaker and it can drop well below 35 without the light ever coming on. This tells me that as tire pressure increases, the lower radius increases to a point and then stops increasing.
Just something I have noticed, that's all.
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