Quote:
Originally Posted by Half Fast Rusty
I just had an interesting situation this week. I set my PSI at 110 cold (not sure what cold is except not been on the road today). When I left home a few days before, three tires were at 110 and one was at 105 (unknown reason and didn't correct it as I was already on the road). I was running up the California valley where the temps were above 100 all day. Where I started that day (temp at about 95 when I started) the three were 115 and of course the other was 110. The temps ran about 128 all day on the three until we hit Redding (temp that day was 112) the tires went over 131 setting the alarms off. Boy does that wake you up! We had the alarms set at the recommended 20% over the cold pressure (132). We pulled off to check the tires for issues. None. I let a little air out to settle the alarms and proceeded home which was about an hour away.
So I guess the question is what is cold temp? At my home when we generally leave the ambient temp runs less than 70. Down in central Cal that day it was 95 and made a huge difference in the starting temp and pressure of the tires.
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I would run your high pressure alarm up another 15-20 PSI. I had my rig out early this week with temps over over 120. Tire temps went to 130-135 and pressure about the same.
I have always used 60 deg as a cold temp but do not believe there is a standard. I guess my thought comes from my flying days where the standard aviation day is 59 deg.