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Old 03-06-2014, 01:00 PM   #21
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In the car world I come from, tires are regularly delivered from the factory 10 and 15 PSI overinflated. Helps with two things, makes sure the car hits the dealer with enough pressure no matter how long it was stored and it helps prevent flat spots on the tires from storage.

Wouldn't surprise me if the same thing happens in the RV world and they might have missed checking the pressure.

And gauges do fail, my Snap On stick gauge failed on me when I was topping my TT tires up to trade it. Read 75 on one check, shot to 120 the next. Kept happening so I had to toss it. And I liked that gauge too, I had it for 15 years.
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Old 03-06-2014, 01:16 PM   #22
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YES! When we leave in April from MN and head south, I leave with 56 lbs of air in my D rated tires. By the time I get to Missouri, I have to start letting out air. (Yes, cold tires).

As an aside, my trailer originally came with C rated tires. My rims are only good for 60 psi. Since I'm way over on capacity, I don't worry about running 56 lbs cold. Just trying to keep everything within tolerances.
Had (TPMS) on last unit,very touchy reading,all Temp & Press OK in AM when leaving. Headed South,at 11 am SUN side Temp & Press UP! Same thing when Sun went to other side. I am NOT going to (Let Air Out) from side to side on a Trip? Youroo!!
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Old 03-06-2014, 01:20 PM   #23
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Originally Posted by youroo View Post
Had (TPMS) on last unit,very touchy reading,all Temp & Press OK in AM when leaving. Headed South,at 11 am SUN side Temp & Press UP! Same thing when Sun went to other side. I am NOT going to (Let Air Out) from side to side on a Trip? Youroo!!
This is the main advantage of Nitrogen filled tires, constant pressure no matter the temp.
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Old 03-06-2014, 01:30 PM   #24
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This is the main advantage of Nitrogen filled tires, constant pressure no matter the temp.
My last camper had the sticker denoting nitrogen filled (bought new) and I still had some variation in pressures with temp changes. Maybe less than with compressed air???
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Old 03-06-2014, 01:49 PM   #25
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Physics still apply, but with N2 it's a far smaller change, usually less than a pound with typical temps. Now, if you're reading 79.5 and it rises .6 psi you'll still see a change from 79 to 80.

But if you were seeing a large swing, two or three psi, then odds are there wasn't N2 in there. Shop air and likely moist shop air to boot.
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Old 03-06-2014, 02:34 PM   #26
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Physics still apply, but with N2 it's a far smaller change, usually less than a pound with typical temps. Now, if you're reading 79.5 and it rises .6 psi you'll still see a change from 79 to 80.

But if you were seeing a large swing, two or three psi, then odds are there wasn't N2 in there. Shop air and likely moist shop air to boot.
I would see several PSI change in mine. I might be at 62 PSI on a cold morning, say 25 degrees, but then be at 70 PSI while towing that afternoon with temps at 70 degrees, for example.
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Old 03-06-2014, 09:20 PM   #27
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I would see several PSI change in mine. I might be at 62 PSI on a cold morning, say 25 degrees, but then be at 70 PSI while towing that afternoon with temps at 70 degrees, for example.
Rule of thumb is 1PSI for every 10* change in temperature, for properly dried shop air. So you were seeing probably 100* at the tires, which I would consider consistent in 70* weather. So I sincerely doubt you have purified N2 in your tires.

Whomever installed the N2 should be able to check it and then exchange it back at no charge, that's usual.
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Old 03-07-2014, 09:03 PM   #28
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Do a search online for a tire size/load /pressure required.I replaced my c rated with e rated tires for safety,Maxxis tires has a chart and for my 8,000 lb axles I run 65 PS I for that maximum load rating and not the 80 PS I max rating.Not a problem,tire temps are low with excellent wear pattern. The chart will help you understand the pressure requirements-
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Old 03-08-2014, 07:44 AM   #29
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I always go by the placard, on my cars and TT. It takes into account the weight of the vehicle to give you a psi for the optimum footprint of the tire contacting the road. If you overinflate, the full width of the tread will not be in contact with the road. The tire will wear more in the middle, and there will be less tread area supporting the weight of the TT.

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Old 03-08-2014, 09:08 AM   #30
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Auto/truck makers set pressure based upon load not the max for the rated tire.TT makers always set standard to max tire rating,its just the way they do it to cover their butts for overload.I suspect some blowout issues are caused by over inflation etc.I found the standard inflation load/size/pressure table used by the tire manufactures.lets use my tt trailer size of st225x75r15.The C rated tire will carry the following loads/pressure.psi/load=40/1880,45/2020,50/2150 (max pressure), the same E rated tire psi/load= 55/2270,60/2380,65/2540,70/2620,75/2720,80/2830(max load.I use E rated with 8,000 lb axles set COLD at 60-65 psi. THESE PRESSURES ARE THE DOT GUIDLINES USED BY ALL MANUFACTURES TO SET LOAD RANGE RATINGS.Also,they fit the same rims as my C tires did and carry better load within the pressure rating of the rim which is 60 psi cold with a 10 % heat adjustment.
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