cujo1950
victorville, ca.
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Joined: 09/15/2003
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We're leaving on vacation this weekend and are crossing the Mojave Desert thru So. Ca. and Arizona. The forcast is up to 115 degrees during the day. My question is would you still fill the tires up to max. 80 psi, or drop a few lbs. for expansion in this extreme heat. I understand the cold pressure should account for normal heat expansion but at these extremes????????
Steve
2006 Dodge 2500 CTD, Auto
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Cox89XJ
Tennessee
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I would air mine to max.
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smkettner
Southern California
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Air them to the max tonight when cold.
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silverfoxn
Georgia
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The question should be; How much damage to the tires can I expect if I drive on them before they reach their "normal pressure" if I don't fill them to their "cold pressure" before dirving? I guess that you could stop and let some air out when they get hot and then stop again and add more air as they cool down. Mine call for 80 PSI cold and that's where I put them. If you are really worried about the heat, drive at night. I do sometimes.
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Fulltimers
Anywhere, USA
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Just fill them to the recommended cold pressure for your load and don't worry about it. The tire manufacturers plan for these conditions.
Fulltimers
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SoCalDesertRider
SanDiego, CA, USA
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I lived in Phoenix for several years. The tires don't mind the high temperatures at all. Fill them as you normally would and drive on them as you normally would.
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BurbMan
Long Island, NY
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Always start out by airing the tires up to the max psi when cold (prior to 7am). Note the ambient temperature at the time when you check the tires.
Temperture then changes at 4 critical times each day, 10am, noon, 2pm and 4 pm. Best way to handle this is to take a break as close as possible to these critical times and assess your tire situation.
Using a digital tire gauge, record the current psi for each tire. Using your infrared thermometer, record the temp of each tire in degrees F. Using a pair of calipers, measure the section width of each tire at the widest point along the sidewall. Compare the measured sidewall width to the spec width provided by the tire manufacturer, and if increased by more than 3.5%, then possible pressure adjustment is warranted. Calculate both the temp rise at the tire and also the psi increase from the baselines noted when cool. If the square root of the sum of the differences exceeds the section width variance by more than a factor of 1.0, then adjust the pressure on a per-tire basis in increments of 0.5 psi until an acceptable ratio is obtained.
Or, just leave them at 80, they will be fine.
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bdougt
Now Louisiana, Eventually Michigan
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BurbMan wrote:Always start out by airing the tires up to the max psi when cold (prior to 7am). Note the ambient temperature at the time when you check the tires.
Temperture then changes at 4 critical times each day, 10am, noon, 2pm and 4 pm. Best way to handle this is to take a break as close as possible to these critical times and assess your tire situation.
Using a digital tire gauge, record the current psi for each tire. Using your infrared thermometer, record the temp of each tire in degrees F. Using a pair of calipers, measure the section width of each tire at the widest point along the sidewall. Compare the measured sidewall width to the spec width provided by the tire manufacturer, and if increased by more than 3.5%, then possible pressure adjustment is warranted. Calculate both the temp rise at the tire and also the psi increase from the baselines noted when cool. If the square root of the sum of the differences exceeds the section width variance by more than a factor of 1.0, then adjust the pressure on a per-tire basis in increments of 0.5 psi until an acceptable ratio is obtained.
Or, just leave them at 80, they will be fine.
DUDE - that is a hoot!!!! Good One.
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Mark Kovalsky
About 60 miles SW of Detroit
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silverfoxn wrote:I guess that you could stop and let some air out when they get hot and then stop again... ..to change the tires that blow from underinflation.
Mark
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Steveque
Central California
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Joined: 08/11/2004
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If I may make a suggestion. As long as you are in California, the maximum tow speed is 55. I doubt you will overheat your tires at that speed.
I just finished a 6300 mile tow. While going through Texas where normal posted speed is 80, I witnessed several trailers alongside the road with blownout tires. Each of them had passed me at or near 80 mph. I maintained a sensible 60 mph everywhere except California. I never worried about the heat and it was warm - 100+ on several days.
Steve Quesenberry
Central California
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