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Old 02-02-2012, 09:37 AM   #1
LarryL
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tire presure

About tire pressure I inflated the tires on my truck it's
a silverado 2500 HD has air pressure gage built in
50lb front 80lb back aired back to 80lb cool next day
when I drove the truck they started at 79lb and as
I drove they went up to 82lb now my question is
the tag on the trailer has 80lb on it if I inflate the
trailer tires to 80lb cold are they going to
increase in pressure like the truck
should I just put 78lb in them?
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Old 02-02-2012, 09:57 AM   #2
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I believe that tire pressure is always rated at "cold PSI". I fill the cold tires up to the max stated on the tire sidewall or as stated on the door pillar of the truck or instructions with the trailer. I fill the truck with 60 PSI front, 70 PSI back as per door pillar and the trailer at 65 PSI as per trailer tire sidewalls. I have checked the truck tires after driving for awhile and depending on the speed I'm driving and how hot/cold a day it is the PSI can be from 5-10 PSI higher than "cold"
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Old 02-02-2012, 10:35 AM   #3
LarryL
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Thats what I'm wondering my trailer has 80lb max stated
on trailer so if I inflate to 80lb down the road after a couple
hours I could have 90lb in thoughts tires?
80lb is also on the tires as max cold
I only inflate when cold and the sun is not or has not been
on them my trailer is in covered storage
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Old 02-02-2012, 10:41 AM   #4
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I found this at TireRack:

The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower).

Other stuff I read is that “Cold” means in the morning before the sun shines on it.

With the above in mind, if it’s a big temperature swing, I inflate to a pound or two below max in the morning.
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Old 02-02-2012, 11:42 AM   #5
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I AM GONNA GET MY HEAD BIT OFF BUT HERE GOES. TIRE PRESSURES ARE COLD NOT WARMED UP. ARE YOU READING THE PLACARD ON THE TRAILER OR THE "MAX PRESSURE AT MAX LOAD" ON THE SIDE WALL? THE PLACARD RULES BUT THE TIRE MUST BE OF THE CORRECT LOAD RATING TO CARRY THE PRESSSURE OF THE PLACARD. IE LOAD RANGE ' OR D" TIRES WILL NOT CUT IT IF YOU NEED "E"TIRES. GET A GOOD GAUGE AND A POUND OR 2 +OR- WILL NOT CHANGE THE WORLD. I WORK IN A GAS STATION AND I SEE PEOPLE PUTTING 40 LPS INTHIER TIRES BECAUSE THE TIRE SAYS IT THEY NEVER SEE THE PLACARD ONTHE DOOR OF THE CAR TRUCK ETC. GOOD LUCK YOU ARE DOING IT RIGHT PS COLD IS NOT BEING DRIVIN BEFORE CHECKING THE SUN BEATINGON THEM WILL RAISE THE PRESSURE BUT NOT BY AS MUCH AS YOU WOULD THINK. THIS IS WERE I AM GONNA GET IT. BUT I HAVE CHECK THEM AM PM SUN NO SUN ONLY CHANGES BY 1-1.5 PSI MOST GAUGES ARE NOT THAT ACCURATE
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Old 02-02-2012, 01:28 PM   #6
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Good advice, Barney. The important thing is to check pressures often. As you say, a variation of a pound or two from the recommended pressure isn't very important on trailers.
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Old 02-02-2012, 03:56 PM   #7
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For maximum load rating inflate to maximum "cold" inflation. Yes, the pressure will increase as you drive but LT and ST tires are designed to handle 10% over max. pressure rating. By lowering the cold pressure you increase the flex and squirm of the side-wall which increases heat and rolling resistance which in turn can actually increase the hot pressure higher than the tire inflated to the max. cold inflation.

Now that I have confused everyone including myself. Simply: Lowering the pressure of a hot tire will cause it to heat up even more when you continue driving. JM2¢, Hank

Common sense applies to extreme conditions like desert driving. Early morning may be 40°F and afternoon over 100°F. Pressure may need to be adjusted but this is an extreme.
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Old 02-02-2012, 04:20 PM   #8
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Howdy All;

The biggest factor in generating heat in a tire is friction from the road.
Or ... a big fire.... The plackard inside the trailer is great for tires that are the same size and load rateing. If you have changed the size and load rateing then you need to follow the tire manufactures' recommendation.

Them is my opinion... please allow for exchange rates and inflation (), values before deceiding the value of this post...

hankaye
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Old 02-02-2012, 04:36 PM   #9
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Quote:
Originally Posted by hankaye View Post
Howdy All;

The biggest factor in generating heat in a tire is friction from the road.


Them is my opinion... please allow for exchange rates and inflation (), values before deceiding the value of this post...

hankaye
I agree, lowering the pressure increases the footprint, increasing rolling resistance and friction ...... more heat .... more pressure.

And Hank, I also agree that both of our opinions may also be filled with hot air.
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Old 02-03-2012, 09:42 AM   #10
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Tire manufacturers allow for increased PSI which obviously occurs as the tire warms up just sitting, or when being driven. Inflate to your correct cold PSI in the AM and you don't have to adjust PSI during the day.
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Old 02-03-2012, 12:09 PM   #11
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SEDE TOLD YA THIS WOULD START SOMETHING! BUT LIKE THE HANKS I TO AM FILLED WITH HOT AIR
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Old 02-04-2012, 09:56 AM   #12
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Take it from a guy who changed 2 blowouts on the side of I40 last august, fill them to the max while they are cold. The tire mfg takes into account the heat build up and corresponding pressure increase when rating tires. I spent LOT on line investigating this after that trip.
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Old 02-06-2012, 06:07 PM   #13
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Nitrogen in tires

does any one use nitrogen in their trailer tires and how has that worked for you.
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Old 02-06-2012, 08:59 PM   #14
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chuck5180, Howdy;

When I was in the Navy we used nitrogen for aircraft tires. worked fine.

Question, do you intend to carry a nitrogen bottle with you for top-offs ? If not, where do you expect ot find it while on the road ? Ok, 2 questions, sorry.

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Old 02-07-2012, 06:06 AM   #15
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MOST TIRE STORES HAVE NITROGEN. AIRCRAFT AND RACE CARS USE NITROGEN. I USED IT WHEN RACING GOKARTS. BUT LIKE HANKEYE SAID IT IS NOT AVALIABLE EVERY PLACE. I DO NOT FILL MY TRAILER TIRES FOR THAT REASON. NITROGEN IS MORE STABLE AND HEAT WILL NOT AFFECT PRESSURE. BUT A CORRECTLY FILLED TIRE IS SAFE IT IS UNDER FILLED THAT THE TEMP WILL RISE AND CAUSE THE BLOW OUT AKA FORD EXPLODERS. I CAN SAFELY SAY MOST RVER'S ARE GOOD ABOUT MAINTAINING TIRE PRESSURES I HAVE REARLY SEEN A LOW TIRE AT A CAMPGROUND OR ON THE ROAD
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Old 02-07-2012, 09:19 AM   #16
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Nitrogen in tires

Thanks guess just used to having it readily available, ran it in my big truck tires
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Old 02-24-2012, 04:59 PM   #17
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O-k here's another thought...does the air pressure change in your tires when your changing elevations...I was watching the air pressure monitor on our 08 Buick luzerne when coming out of the mountains in Virginia into North Carolina...the air pressure changed 3-4 lbs...but it might have been outside tempurature change because the weather changed quite alot that mourning
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Old 02-24-2012, 05:08 PM   #18
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Mine definitely change. Gained 5+ lbs going from 750 feet warm weather to 13,000 feet cold weather.
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Old 02-24-2012, 08:45 PM   #19
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sdayman, Howdy;

Look at the differance in atmospheric pressure.......
Less external pressure would lead to more interior pressure.

Lots and lots of things effect the pressure in your tires.
Outside air temp., rian and other moisture on the road. elevation (both up and down), where ya live where ya go and how ya get there..... Road surface,
number of curves in a strech of road (moer in a short strech or less in a long strech), so on and so forth...
just thoughts (like peas), rattlin' 'round in the tin can of a skull I have...
The tire manufactures account for most of that when they design them, test'em so forth and so on some more......

hankaye
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Old 02-25-2012, 05:41 AM   #20
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I guess I have had too much "free time" the last couple of days and have been surfing the web. I ran across this and found it "interesting" Has anyone else seen or heard of increasing tire pressure "above the recommended max" before???

Special Trailer (ST) Tire Speed Ratings

Industry standards dictate tires with the ST designation are speed rated to 65 MPH (104 km/h) under normal inflation and load conditions.

However industry standards also stipulate, if tires with the ST designation are used at speeds between 66 and 75 mph (106 and 121 km/h), it is necessary to increase their cold inflation pressure by 10 psi (69 kPa) above the recommended pressure for the rated maximum load.

Do not exceed the wheel’s maximum rated pressure. If the maximum pressure for the wheel prohibits the increase of air pressure, then maximum speed must be restricted to 65 mph (104 km/h).

The cold inflation pressure must not exceed 10 psi (69 kPa) beyond the inflation specified for the maximum load of the tire.

Increasing the inflation pressure by 10 psi (69 kPa) does not provide any additional load carrying capacity.


This all came from tirerack.com. The actual weblink is: http://www.tirerack.com/tires/tirete...jsp?techid=219
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