TPMS - Tire Pressure Increase
Tire pressure increases while traveling. In researching I have seen where a 25% increase in pressure is fine. So at 65PSI I could expect to see pressure up to around around 81 and all should be good. ...
Forum Discussion
I used my made tirepresure/temperature-calculator for wet and dry gascompound.
65psi at 65 degr F. measured rising to 81 psi, means a temperature in tire of 170 degr F. if dry gascompound, and 149 degr F. If enaugh water in tire, like with normal air filled.
So if filled with Nitrogen 25% pressure rising is to much, but if filled with normal air, on a hot day its OK.
I once estimated that on a hot day of 100 degr F. the temp in tire is allowed to rise to 160 degr F, on a 70 degr F day driving 140 degr F in tire max.gives rising to 76.4psi dry and 78.9psi wet is about 20% rising.
Then tire-material wont go over its critical temperature of by me estimated 300 degr F.
And not overheating any part of tire-material is main goal of tirepressure determination.
So never blead down a hot tire, as already written, even dont anticipate on " to high pressure by filling lower cold pressure.
And I want to go a bit further, but" tirespecialists" dont agree with me.
Let the cold pressure flow with ambiënt temperature, so dont lower it to determined best at 100 degr F. ambiënt temperature, even if above maxloadpressure of tire, yours 65psi.
The tire needs the higher pressure to give lesser heatproduction, because cooling down is also lesser, because of lesser temperature-differences between tire-material and air in and out tire.
65psi at 65 degr F. measured rising to 81 psi, means a temperature in tire of 170 degr F. if dry gascompound, and 149 degr F. If enaugh water in tire, like with normal air filled.
So if filled with Nitrogen 25% pressure rising is to much, but if filled with normal air, on a hot day its OK.
I once estimated that on a hot day of 100 degr F. the temp in tire is allowed to rise to 160 degr F, on a 70 degr F day driving 140 degr F in tire max.gives rising to 76.4psi dry and 78.9psi wet is about 20% rising.
Then tire-material wont go over its critical temperature of by me estimated 300 degr F.
And not overheating any part of tire-material is main goal of tirepressure determination.
So never blead down a hot tire, as already written, even dont anticipate on " to high pressure by filling lower cold pressure.
And I want to go a bit further, but" tirespecialists" dont agree with me.
Let the cold pressure flow with ambiënt temperature, so dont lower it to determined best at 100 degr F. ambiënt temperature, even if above maxloadpressure of tire, yours 65psi.
The tire needs the higher pressure to give lesser heatproduction, because cooling down is also lesser, because of lesser temperature-differences between tire-material and air in and out tire.
