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
This week on our trip I took a look at tire pressure/temp. In the morning before starting one tire 63psi, 55F. After about 30 minutes of driving and outside temps up to 65F, that tire was at 78psi, and 90F. Other tires basically same pattern. Now the "sunny side" of the trailer had tire temps noticeably hotter, 10F or so. and higher pressure as well likely from heat absorption from the sun hitting the black tire.
Now if outside temps hit 90F, I would expect a slight increase in pressure, most of the pressure increase is due to friction induced heat.
Now, the other unkown is how accurate is the temp reading for a TPMS?? Is it measuring rim temp? air temp? or some combo.
And then factor in how dry the air in the tire is. If it is dry, boyles law works nice. if there is moistue (water) expecially if it condenses, pressure will bump up noticeably once it become a vapor. which is a strong function of temperature.
Now if outside temps hit 90F, I would expect a slight increase in pressure, most of the pressure increase is due to friction induced heat.
Now, the other unkown is how accurate is the temp reading for a TPMS?? Is it measuring rim temp? air temp? or some combo.
And then factor in how dry the air in the tire is. If it is dry, boyles law works nice. if there is moistue (water) expecially if it condenses, pressure will bump up noticeably once it become a vapor. which is a strong function of temperature.
