Might be for 2 reasons why you want to know this.
First already given for the probable other outside temperature tomorrow then tonight.
Then you must know that advice pressure is given for 65 degr F, and between 55 and 75 the difference is nihil.
But if higher temp , for instance 100 degr F , the pressure rises cold measured that much that you cant deny it.
But at that temp , the tire needs this higher pressure to give lesser heatproduction ( because of lesser deflection) , the cooling down is also less then because of the smaller temperature difference between hottest part of rubber of tire, and outside and inside tire temp.
Second reason , I think you mean, is that loaded the tire gets higher presssure. And that is not true.
Its even so , that if you fill the tire off the ground, so with zero weight on it, to for instance 80 psi, and you get it ont the ground fully loaded, you still measure 80 psi. I once checked it with my own car , by measuring several times yacked up and on the ground, and its true.
So fill the tire to best determined advice pressure for the weight on it and speed used, calculated back to 65 degr F.
And when you check, also check the outside temperature at that check.
If between 55 and 75 degr F outside, dont bother to recalculate, but for higher then 75 degr F recalculate ( for wich I give here a list). When below 55 degr F , you can fill to advice pressure, for giving same deflection of tires, and so better fuel saving, but for savety not needed, yust look in the list I give, to see if the pressure dropp is in line with the temperature dropp.
Cold pressure is when inside tire temp= outside tire temp, that simple.
When driven the bending of rubber heats up the tire inside, so you dont measure the cold pressure. Also when sun is shining on the black tire, it heats up the tire inside, so tire inside is hotter then tire outside, and you again dont measure the cold presssure.
Here the list and use it like this.
determine best advice pressures for front and back and eventual Tag axle. Then look this up in my list at the line 65 degr F , is fatt printed. Then when adjusting also note the outside tire temp so ambiรซnt temp. and look in the row what pressure it has to be for that temp, and fill or adjust to that pressure.
Mostly you will find that if you check and note the ambiรซnt temp, that the pressure is in line with the temperature. so you dont have to adjust, so do nothing.
You can also take over , only your advice pressure for intervalls of for instance 20 degr from 65 degr F. and store that somewhere.
First already given for the probable other outside temperature tomorrow then tonight.
Then you must know that advice pressure is given for 65 degr F, and between 55 and 75 the difference is nihil.
But if higher temp , for instance 100 degr F , the pressure rises cold measured that much that you cant deny it.
But at that temp , the tire needs this higher pressure to give lesser heatproduction ( because of lesser deflection) , the cooling down is also less then because of the smaller temperature difference between hottest part of rubber of tire, and outside and inside tire temp.
Second reason , I think you mean, is that loaded the tire gets higher presssure. And that is not true.
Its even so , that if you fill the tire off the ground, so with zero weight on it, to for instance 80 psi, and you get it ont the ground fully loaded, you still measure 80 psi. I once checked it with my own car , by measuring several times yacked up and on the ground, and its true.
So fill the tire to best determined advice pressure for the weight on it and speed used, calculated back to 65 degr F.
And when you check, also check the outside temperature at that check.
If between 55 and 75 degr F outside, dont bother to recalculate, but for higher then 75 degr F recalculate ( for wich I give here a list). When below 55 degr F , you can fill to advice pressure, for giving same deflection of tires, and so better fuel saving, but for savety not needed, yust look in the list I give, to see if the pressure dropp is in line with the temperature dropp.
Cold pressure is when inside tire temp= outside tire temp, that simple.
When driven the bending of rubber heats up the tire inside, so you dont measure the cold pressure. Also when sun is shining on the black tire, it heats up the tire inside, so tire inside is hotter then tire outside, and you again dont measure the cold presssure.
Here the list and use it like this.
determine best advice pressures for front and back and eventual Tag axle. Then look this up in my list at the line 65 degr F , is fatt printed. Then when adjusting also note the outside tire temp so ambiรซnt temp. and look in the row what pressure it has to be for that temp, and fill or adjust to that pressure.
Mostly you will find that if you check and note the ambiรซnt temp, that the pressure is in line with the temperature. so you dont have to adjust, so do nothing.
You can also take over , only your advice pressure for intervalls of for instance 20 degr from 65 degr F. and store that somewhere.
