Cold tire pressure vs hot
Trying to set a tpms system. How much should a 225-75-16 tire pressure rise from 60psi cold to ?hot?, assuming outside temp of 70*. On the tpms you set for cold pressure. It will alarm at 15% . I ...
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On my TST system, the defaults were minus 10% and plus 20%. For my rear tires , cold pressure 80 psi. The low alarm would go at 72 psi and high pressure at 96psi.
I changed the high pressure alarm to about 104, because of driving in 100f temps. The side in the sun were just over 100psi, but the shady side stayed around 95 , 96 psi
The high temperature alarm was defaulted to 160f. My tires were close to alarming that day as well. That temperature did agree with my infrared temp, I also checked a couple of parked trucks and there temps ranged from 170-180 on the driving sunny side.
I’m much more concerned about low pressure than the highs, so I reset the low pressure alarm to 75 psi. Also the appropriate change for the front axle where I run 65 psi
Ken
I changed the high pressure alarm to about 104, because of driving in 100f temps. The side in the sun were just over 100psi, but the shady side stayed around 95 , 96 psi
The high temperature alarm was defaulted to 160f. My tires were close to alarming that day as well. That temperature did agree with my infrared temp, I also checked a couple of parked trucks and there temps ranged from 170-180 on the driving sunny side.
I’m much more concerned about low pressure than the highs, so I reset the low pressure alarm to 75 psi. Also the appropriate change for the front axle where I run 65 psi
Ken
