Tire pressure increases

[Tbeau1957]

I have my air pressures set at 110 psi on my from tires.
After driving for a couple of hours....my tire pressure sensor alarm goes off and tire pressure gets up to 127 psi. What makes the pressure rise?

[dan-nickie]

Normal. All tires heat up and the pressure increases while driving.
Increase your alarm settings.

[Sweetbriar]

Heat

[dexters]

Originally Posted by Tbeau1957

I have my air pressures set at 110 psi on my from tires.
After driving for a couple of hours....my tire pressure sensor alarm goes off and tire pressure gets up to 127 psi. What makes the pressure rise?

Several thing

Major ... friction of rotating tires on the road

Minor ...
Sunlight
Ambient temperature
Increase in altitude

You should check you tire pressures when they are cold and have not been used. Even sunlight on tires will affect the pressure.

[Crasher]

Set your alarm psi higher. I sometimes get a 20% increase on a hot day. If the cold psi is correct for the load, don't worry about the pressure increase. It is all a normal part of the tires characteristics when rolling down the road.

[JFXG]

Google “Boyle’s Law”