good question !!!
door jam shows pressure for YOUR cars tires at deliver to your country.
so does glove box manual.
some markets get diff. tires. and have diff pressure stickers.
if your tires have been changes, the correct pressure is found , no joke, that the company that made your tires.
go there look it up and get the pressures for the weight of your vehicle.
they ALL have a chart.
and yes over pressure makes them skid on ice , snow or water.
they crown.
so does under pressure, they cup.
the degree varies by ever tire ever made.
read tire markings.
write it down.
go to
www.yourtire company and just look it up.
there is no better answer.
go to tire store and he has the same books and the same tables and he will look it up for you , if your prefer that.
hope that helps.