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Old 02-12-2016, 07:09 AM   #29
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Originally Posted by SuperSteer View Post
As a former tire guy and current A.S.E. certified auto and med. /hvy. truck technician I wholeheartedly endorse TPMS systems! I'm not a mathematician or fortune teller, but I know the majority of "blow-outs" are caused by underinflation or"run-flat". If you've ever gone out to your vehicle and found a flat tire, chances are it was a slow leak and could have been avoided by a tpms system alerting you when it began to lose pressure. Also if one tire begins getting hotter than the others, you can investigate and correct the issue BEFORE a tire failure.
I don't get wrapped up in pressure increase while driving but it sure is nice to know if a tire has a leak and PSI is correct before I leave
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Old 02-12-2016, 08:05 AM   #30
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Here is what has worked for me. I did a six position weigh to know exactly what each position was carrying. The fronts called for 110 psi, so I set them at 115 psi 0n a morning when the OAT was 60*. I did the same with the rear tires. Over the course of a year and 9000 miles of travel from 1000' elevation up to 11,000' and from 35* mornings up to 75* mornings, the start pressure was never lower than 110 psi or higher than 120 psi on the front tires. On a 90+* day in the sun on hot asphalt the front pressures have risen to 142 psi. Perfectly normal according to Michelin. It was over a year before I had to add air to get back to the 115 psi on a 60* morning. I'm on the third year with this method and it's working great.

Crasher has a great system here and is exactly my procedure. For the last two years, I have adjusted my pressures before I leave Gatlinburg. I adjust to the bottom of my target range and this year the OAT was about 20 degrees. In mid summer, with OAT around 90, the cold PSI will still be in range and all is good. New TPMS users always get caught up in getting those pressures exactly where we want them. You will soon learn to work within a range of acceptable temps.
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Old 02-12-2016, 12:46 PM   #31
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If that was true then why does it keep coming up time after time?
For two reasons that come to mind; first, new members need to ask questions they consider important, without searching past threads for days; second, the whole load/inflation chart thing is misunderstood by many people who think lower air pressure makes a softer ride-which tire manufacturers dispute.
Remember the Ford Explorer roll-overs? They were caused by insufficient air pressure, as recommended by Ford to soften the ride. Ride was not softened appreciatively , but it did improve odds of a crash/roll-over due to excessive sidewall flex.
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Old 02-12-2016, 01:14 PM   #32
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For two reasons that come to mind; first, new members need to ask questions they consider important, without searching past threads for days; second, the whole load/inflation chart thing is misunderstood by many people who think lower air pressure makes a softer ride-which tire manufacturers dispute.
Remember the Ford Explorer roll-overs? They were caused by insufficient air pressure, as recommended by Ford to soften the ride. Ride was not softened appreciatively , but it did improve odds of a crash/roll-over due to excessive sidewall flex.
Sidewall flex? Low Tire pressure builds excessive heat...
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Old 02-12-2016, 01:21 PM   #33
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Sidewall flex? Low Tire pressure builds excessive heat...
And the low pressure is what causes the sidewall flex that causes the temp increase.
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Old 02-12-2016, 01:26 PM   #34
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And the low pressure is what causes the sidewall flex that causes the temp increase.
And the owner failing the have the correct amount of air pressure in the tires causes the sidewall flex, builds heat and Boooom!
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Old 02-12-2016, 09:22 PM   #35
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And the owner failing the have the correct amount of air pressure in the tires causes the sidewall flex, builds heat and Boooom!
Dead on!
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