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Need from tires next to yudge the pressures. 1. Maximum load or loadindex 2. Kind of tire to determine the referencepressure. 2 choices here, Standard load AT 36 psi, and XL/reinforced/extraload AT 42 psi. 3, Speedcode, less important. Shal be Q or above fir wich maxload is given for upto...

Even if you have that almost 100% Nitrogen in tire, you can fill up with normal air. And normal air is better, because of the water as humidity in it. Pressure rises higher when heated up by driving, but temperature of gascompound in tire stays lower. The extra pressure by water, gives lesser...

Registered to this forum to answer here. Call myself " pigheaded Dutch selfdeclared tyrepressure-specialist " , story began end 2007, when I got hold of the officiall european formula to calculate pressure for load and speed , and went running with it. Have no Porche , only old cheap car, so...