Quote:
Originally Posted by cjeezy
Ok. Thanks. I guess ill leave them at 35 then. I just don't understand why the tire doesn't just say max pressure 35 psi lol
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The tire can handle 50 psi but if you actually set that pressure you would be running on a tiny contact patch in the middle of the tire due to the pressure ballooning it out, you'd wear your tires out quickly and have reduced grip. Typically you increase pressure as you increase load so that the two forces cancel each other out. 35 psi cold as recommended on the car gives you the best tire contact patch and therefor best traction for daily driving. Same tire on a different car may experience different loads and thus call for different pressures.
The TPMS triggers for the warning light are approximately < 30 psi and > 40 psi. Racing on track can generate a lot of heat and thus generate a lot of extra pressure, so that may require dropping the cold pressure slightly in order to reach an ideal hot pressure of 35-40 psi.