Trislander
I think you've made an error with your formula.
For the tyre gauge to indicate anything the pressure on one side of the gauge must be greater than the other. It's a differential instrument. In this case it's comparing pressure inside the tyre to ambient pressure outside the tyre.
To use your example, for the gauge to indicate 600 psi the pressure in the tyre has to be 600 psi greater than outside the tyre.
The pressure outside the tyre is 15 psi so the total tyre pressure must be 615 psi & not 585 psi in order for the guage to read 600 psi
Actual (total) tyre pressure = indicated plus ambient
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Last edited by Tinstaafl; 26th May 2002 at 00:39.