I have 40 max psi on my tires what psi should I have in them
Open the drivers door and on the door jamb there will be a plaque that lists what the tire pressure should be . Or any tire shop will answer this for you .
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Most passenger cars take 32psi but it’s always best to follow @VOLVO_V70 's advice for your specific vehicle.
Just remember that the pressure is measured “cold”, before driving your car, typically first thing in the morning.
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No, you don’t!
The max pressure will be one of the following: 35, 36, 41, 44, 50, or 51. Long story why that is so. (Barry’s Tire Tech: Load Tables)
The 40 psi is a warning not to exceed this value when seating the beads. That’s not the max usage pressure.