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Old 01-03-2010, 01:59 PM   #1
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Question Tire Pressures

It is 6 below zero outside and just checked the coach tire pressures. All tires are about 20# low from the desired pressure for 70 degrees. We are headed south to Florida. So what should I do, bring the pressures up to recommended pressure even with it so cold, or leave them and see how they are when it's warmer out?
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Old 01-03-2010, 02:11 PM   #2
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Quote:
Originally Posted by Our Time View Post
It is 6 below zero outside and just checked the coach tire pressures. All tires are about 20# low from the desired pressure for 70 degrees. We are headed south to Florida. So what should I do, bring the pressures up to recommended pressure even with it so cold, or leave them and see how they are when it's warmer out?
I don't posses to have the definitive answer to this. I have always wondered about this myself. I put the air back up to where it supposed to be and then check them again as I get further south. I can't remember ever having to let air back out again. Hopefully some tire expert will attempt to clue us in on this.
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Old 01-03-2010, 02:25 PM   #3
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Hi Chuck,
Normally, for a few PSI I'd say do nothing. 20 #s is a lot. Consider filling the tires to the correct PSI. As you get to warmer weather give the tires a check each morning. Keep the PSI correct before you start the day. The same is true on the return trip. To keep from having to fill the tires, during inclement weather, consider putting the PSI at the max, knowing you will be entering much lower temps.
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Old 01-03-2010, 02:37 PM   #4
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welll
my last trip in an aircraft to a climate with extreme temps we checked pressure vessels everyday
as we went north and colder temps the pressures dropped so we topped them off.
then on the return we checked them and dumped air as it warmed up and the pressures rose above what we needed


so tires are just the same
physics demand the pressures will go down as temps drop
so as suggested
top em off, then as you head south and into warmer temps check em each morning or after a period of time that would allow them to cool down.
and adjust psi to maintain them to the psi you need for the weight.
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Old 01-09-2010, 08:07 PM   #5
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Drop the tire pressure about 8lb from the normal set tire pressure and leave it this will allow for the up and down pressure depending on elevation cold and hot temp and you will never need to be concerned about tire blow outs. when you get back to your home town or a place that you will be parking for long period of time fill tires back to the original set tire pressure.
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Old 01-10-2010, 04:55 AM   #6
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katoommaster, not being smart but you really lost me on that one jim
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Old 01-10-2010, 06:40 AM   #7
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Hi beaverjim,
Don't feel alone. I also do not understand why anyone would do what katoommaster posted. The clinical explanation is easy to follow. I just don't follow the logic. I set my cold PSI according to the weight each tire is carrying (at last weigh in). Following katoommaster's instructions I would set my cold PSI to 8 PSI below what the tire mfg recommends!

Not me, I'll keep to the tire mfg's recommendation.
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Old 01-10-2010, 06:41 AM   #8
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Drop the tire pressure about 8lb from the normal set tire pressure and leave it this will allow for the up and down pressure depending on elevation cold and hot temp and you will never need to be concerned about tire blow outs. when you get back to your home town or a place that you will be parking for long period of time fill tires back to the original set tire pressure.
You will have far more tire problems with under inflated tires than over inflated tires. Under inflated tire cause heat to build up that causes belt seperation and side wall failure.
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Old 01-10-2010, 06:51 AM   #9
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Quote:
Originally Posted by Our Time View Post
It is 6 below zero outside and just checked the coach tire pressures. All tires are about 20# low from the desired pressure for 70 degrees. We are headed south to Florida. So what should I do, bring the pressures up to recommended pressure even with it so cold, or leave them and see how they are when it's warmer out?
The proper procedure is to set tire pressure to the recommended pressure where you begin your trip, each day, even if it's cold where you start and warm where you end.
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Old 01-10-2010, 08:17 AM   #10
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If you leave the North and go to Florida you wont need to adjust your pressures because its colder in Florida then it is at the North pole.

Actually I pumped the tires up to max for gross weight and with a 50 degree jump in climate the pressures roze approx 7 psi . I will leave the pressures until we return home next week and in the spring will readjust as necessary.
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Old 01-12-2010, 04:34 PM   #11
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Here's a quote straight from Goodyear: Check and adjust air pressure
• Before each trip.
• Every morning during long trips.
• Before you leave and when you return home on short trips.
• Before and after storing your vehicle.
• At least once per month while the vehicle is in storage.
End Quote.....

This is nuts...
You'd be spending an hour each day just checking the tire pressure and adjusting for air temp as you travel. Every couple hundred miles, every loading change could change the pressure requirement.
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Old 01-12-2010, 05:05 PM   #12
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I agree that would be nuts if you had to adjust for ambient temps every day. I think that might be a good schedule to simply check the tires to make sure a tire has not been leaking air.
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Old 01-12-2010, 05:44 PM   #13
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Chuck,

Glad you asked the question. I'm getting ready to head off to FL in 2 weeks and was wondering what to do also.

In November pressures were set to F-100 R-95 based upon "normal" loaded weight. Today, after sitting since Nov, pressures were F-95 R-86. Initially, I thought the first opportunity to drive it would be when I left for FL but now I'll be able to drive it approx 30 miles roundtrip before leaving so I'll adjust pressure after that.
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Old 01-12-2010, 05:49 PM   #14
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IMHO, checking tire pressures every day (while traveling) is actually a good idea. Nowadays I have a TPMS so checking is done from the drivers seat, but even with the old coach I checked them every morning when traveling.

That has saved me twice from a blowout, once in the old coach an inner dual had dropped to 20PSI (valve stem extender had loosened a little), second time in the new coach an outer dual had dropped 10PSI and set the TPMS alarm off while driving (due to a small leak in the TPMS sensor).

Both times I resolved the problem and aired up the tire with no incident.

As far as adjusting, I always keep the pressures above the tire mfr recommended values for the weight found by doing 4 corner weighing, using the heavier of the axle ends to look up the recommended pressure. I don't worry if they are 10 to 15lb higher, I have 20 to 30PSI headroom between the recommended pressures and the max cold pressure rating of the tire (120PSI).

Some people like to keep the tire pressures close to the recommended pressures because they get better ride, fortunately that is not a problem in our rig. YMMV.

Stewart
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