You can put whatever you want up to the max pressure. Best way to do it in my mind is to play around with different PSI until you find one that feels best. For instance, on my old RSX I liked to run about 31 PSI because anything higher and the tires would lose traction to easily and it felt better suited to my suspension setup. On the Z Ive found that, for me, the best pressure is around 35-36PSI, anything higher, like around 40, and the rear breaks loose to easily, but the handling feels more stable.
Personal preference really.
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