Tire pressure question
My tire pressure question is a little different. I've always believed that side-wall stress and tire wear were the two things you should be concerned with. The former is the culprit for blowouts. I've...
Forum Discussion
Once read in a topic , that tires are tested to can stand a pressure of 2 to 3 times the Pressure behind AT, is officially called reference-pressure , but will use AT-pressure further on..
Also read in a PDF of Semperit/Continental, that when standing still a cold pressure of 1.4 times the AT-pressure gives 2 times the maximum load when standing still.
This means that you could even give the tire a cold pressure of that 1,4 times the AT, wich is for your AT 65 psi tires, a cold pressure of 91 psi .
Asume you would fill this pressure at 32 degr F, so freesing point of water, and temp in tire rises to 212 degr F , so boiling point of water, the pressure would rise to 130 psi , wich is 2 times the AT-pressure of 65 psi, and tires are tested to can stand this pressure .
So dont worry about getting to high pressure, tires and valves can stand this pressure.
I wont say that you must fill your tires to that 91 psi , but if needed, 80 psi at 65-68 degr F would not be a problem.
Will give a list of pressure for temperature, and use it like this.
See first what the ambiënt temp is at the moment you measure your cold pressure ( = when inside tire temp = outside tire temp).
Then look in the list at that temp , for your measured pressure.
Then see what it would be in that row what it would be at 65/68 degr F, and compare that to the advice pressure.
Mind that if your tires are already damaged by overheating of the rubber by using to low pressure for the load and speed , the tires will blow sooner when filled with higher pressure, so only do this to new tires from the beginning , to prefent this damage .
I can help you with determining a save pressure, but need more info .
Also read in a PDF of Semperit/Continental, that when standing still a cold pressure of 1.4 times the AT-pressure gives 2 times the maximum load when standing still.
This means that you could even give the tire a cold pressure of that 1,4 times the AT, wich is for your AT 65 psi tires, a cold pressure of 91 psi .
Asume you would fill this pressure at 32 degr F, so freesing point of water, and temp in tire rises to 212 degr F , so boiling point of water, the pressure would rise to 130 psi , wich is 2 times the AT-pressure of 65 psi, and tires are tested to can stand this pressure .
So dont worry about getting to high pressure, tires and valves can stand this pressure.
I wont say that you must fill your tires to that 91 psi , but if needed, 80 psi at 65-68 degr F would not be a problem.
Will give a list of pressure for temperature, and use it like this.
See first what the ambiënt temp is at the moment you measure your cold pressure ( = when inside tire temp = outside tire temp).
Then look in the list at that temp , for your measured pressure.
Then see what it would be in that row what it would be at 65/68 degr F, and compare that to the advice pressure.
Mind that if your tires are already damaged by overheating of the rubber by using to low pressure for the load and speed , the tires will blow sooner when filled with higher pressure, so only do this to new tires from the beginning , to prefent this damage .
I can help you with determining a save pressure, but need more info .
