TPMS Alert: Tire Pressure Too High?
Loaded up last week in Louisville, ambient temps in the 70's and headed for FL. The LT225/75-16E tires on the TT set to 75 psi. Down I-65 through AL with ambient temps in the 90's...pavement so ho...
Forum Discussion
Running tires results in some flex causing an increase in temperature. Sun will also increase the temp. Although more flex will result in some more heat, I think it's almost impossible for *low* pressure to cause so much heat that it turns into high pressure.
My rear truck tires are 80psi cold, trailer 95psi cold. I've set my TPMS alarms 20psi above that. If it hits that I should look to see if I have a brake dragging or a bearing hot. As long as it's normal pressure increase due to driving and sun I'm not concerned. Tire manufacturers say set them cold and then run for the day.
Last winter we left MN at around 10deg and drove to TX, one day the ambient temp rise was about 40-50degs. TPMS didn't alarm, I did let a couple pounds air out before starting out the next day though since we'd be in warmer temps for a month.
Too low pressure is THE reason for TPMS. The temp indicator is a nice to have which *may* help catch a dragging brake or bad bearing, NOT looking for normal tire temp rise.
My rear truck tires are 80psi cold, trailer 95psi cold. I've set my TPMS alarms 20psi above that. If it hits that I should look to see if I have a brake dragging or a bearing hot. As long as it's normal pressure increase due to driving and sun I'm not concerned. Tire manufacturers say set them cold and then run for the day.
Last winter we left MN at around 10deg and drove to TX, one day the ambient temp rise was about 40-50degs. TPMS didn't alarm, I did let a couple pounds air out before starting out the next day though since we'd be in warmer temps for a month.
Too low pressure is THE reason for TPMS. The temp indicator is a nice to have which *may* help catch a dragging brake or bad bearing, NOT looking for normal tire temp rise.
