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Re: Tire PSI for 225/45-17's
I have 225/50/16 Pirelli P Zero Neros that I typically keep at 40psi front and 38psi rear for a balance between a firm and smooth ride.
Come winter, I use 205/55/16 Bridgestone Blizzaks somewhere in the mid 30s.
I also have 245/40/17 Bridgestone RE01Rs for autocross days, running 40-44psi depending on track conditions, and there's never any appropriate match front to back. At Cherry Valley (our local kart track), I bump the front right tire 2psi because of the track's shape!
My science? Best guess and feel for initial setting, and manufacturer's recommendation for proportion.
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Disclaimer: The above post is on the internet.
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