Tire pressure fluctuation when hot

Old-Biscuit wrote:

locster wrote:
Thank you for the reassurance.

I expected them to increase once heated up, but not by that much. I've read somewhere to expect 1psi increase for every 10 degrees F change. Even my tire monitor sounded the alarm with these numbers. I had to manually override the threshold to shut it up, but was afraid that I shouldn't have ignored them.

Thanks for pointing out 1 psi per 10*F increase....that is the 'standard' on charts.

To increase 18 psi the temp would have had to change 180*F :H

:S:S:S

All tire 'monitors' indicated same 18 psi increase in ALL 6 tires....suspect tire monitoring system error.

YES-tire pressures will increase from COLD to HOT
But you are correct to suspect an 18PSI increase.

So did all 6 tires drop 18 psi when they returned to COLD temp??






TPMS are neat but I still prefer 'old school'
Digital Pressure Gauge (not old old school pencil gauge :B )

Yes, they all dropped to my cold setting pressure after cooling down. I've confirmed the readings from the TPMS on a few occasions with my manual gauge as well.

locster wrote:
Thank you for the reassurance.

I expected them to increase once heated up, but not by that much. I've read somewhere to expect 1psi increase for every 10 degrees F change. Even my tire monitor sounded the alarm with these numbers. I had to manually override the threshold to shut it up, but was afraid that I shouldn't have ignored them.

Thanks for pointing out 1 psi per 10*F increase....that is the 'standard' on charts.

To increase 18 psi the temp would have had to change 180*F :H

:S:S:S

All tire 'monitors' indicated same 18 psi increase in ALL 6 tires....suspect tire monitoring system error.

YES-tire pressures will increase from COLD to HOT
But you are correct to suspect an 18PSI increase.

So did all 6 tires drop 18 psi when they returned to COLD temp??






TPMS are neat but I still prefer 'old school'
Digital Pressure Gauge (not old old school pencil gauge :B )

Thank you for the reassurance.

I expected them to increase once heated up, but not by that much. I've read somewhere to expect 1psi increase for every 10 degrees F change. Even my tire monitor sounded the alarm with these numbers. I had to manually override the threshold to shut it up, but was afraid that I shouldn't have ignored them.

Not only normal but expected.

Tire engineers have already 'planned' on those pressure increases so do NOT adjust tire pressures when HOT.

Set pressures when tires are COLD.......
Cold is not driven on and before the SUN heats them up

Yes, its normal, sunnyside of vehicle or outside duals, may also be higher.

Ken