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      09-19-2017, 07:23 PM   #63
Dalco450
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Drives: X1 M-Sport
Join Date: Mar 2011
Location: Montreal

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Quote:
Originally Posted by kiloTHREE View Post
Besides common sense?
In fact some vehicles these days use ABS sensors to measure when a tire is low on air instead of physical sensors in the wheels. This works because it compares the number of rotations on one wheel to another. When the tire is low, the number of rotations will be higher thus tripping the TPMS idiot light.
With my winter square setup in 225/45R18, I must put 38psi in Fronts and 45psi in Rears. So, it doesn't make sense for your theory of 4psi = X% diameter variance...
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