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Old 08-31-2015, 08:34 PM   #1
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Cool Tire pressure

I've read many times in this forum how important it is to maintain proper tire pressure in your trailer tires. My question is when on the road if in need of air (cold) where do get your air? Do you carry a air compressor,stop at service station after driving several miles. Does anyone use nitrogen rather than compressed air? Thanks in advance for ideas, thoughts.
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Old 08-31-2015, 08:40 PM   #2
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First off nitrogen is a waste of money for trailers. Science and cost does not justify it's use. I and many others carry a small DC compressor and/or 120AC unit. I don't think it is really that important what the brand or cost is. You can get excellent reliable inexpensive compressors from Harbor Freight especially when on sale and 20% off coupons.
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Old 08-31-2015, 08:46 PM   #3
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I carry a Viair 450P compressor that a wise forum member (Robert Cross) helped me convert to run off my 7-pin plug in my truck.
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Old 08-31-2015, 08:47 PM   #4
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Get an inexpensive compressor, but a good tire gauge. I carry an extra long heavier duty 12 volt cord for the longer run from my truck outlet. Only used it once, but sure saved a lot of hassle. Chris
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Old 08-31-2015, 11:56 PM   #5
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We carry a 12 vt compressor you can get one at harbor freight inexpensive. A little slow ,just have a nother cup of coffee gain patience
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Old 09-01-2015, 12:00 AM   #6
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Search results for: '12volt conpresser'
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Old 09-01-2015, 02:50 AM   #7
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I carry a small 12 volt compressor. Never had to use it on the road, but it's there if needed. Note those compressor plugs usually go in the cigarette lighter. Run them long enough and that plug can get hot enough to melt the plug. If you need significant air, find a station that has air. One thing to be aware of is that some stations have pumps that many not have enough power to get to higher pressures. Until I bought a high power pump for home use, only one gas station in my local area could fill my 16" Michelin LT's to 80 psi. The local QT and other convenience mart stores may not have pumps that can reach that pressure.

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Old 09-01-2015, 09:07 AM   #8
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If you follow "best practice" and are inflating your tires to the pressure on the tire sidewall that is associated with the max load you should not need more than a couple of psi to "top off" your tires say once a month.

Tires should loose no more than one to 2 % a month. If you see faster then you need to investigate, find and repair the cause. I have a number of posts on my blog with the label "valve" that provide examples.

An alternative to carrying a compressor might be.
1. Measure your CIP with your digital gauge and record the number of psi needed in each tire.
2. Assuming you are not under-inflated for the measured tire load, i.e. are between your minimum inflation based on load and the tire sidewall pressure you can drive to the nearest service station.
3. Measure your hot inflation and add the number of psi needed in #1 above plus 1psi
4. Next morning confirm you now have your correct CIP.
NOTE if you are below the pressure needed to carry the actual load then you need to add air before driving anywhere.

The above is why you need to know your actual tire loads even if you are running the tire sidewall pressure to lower your Interply Shear force.
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Old 09-01-2015, 09:12 AM   #9
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I carry two Honda 2000 generators and a 110v compressor. If I need air on the road, I can fire up a generator (my compressor will run on one of the generators). If I need air when connected to shore power, there's no need for the generator to power the compressor. My compressor is a 150lb pancake style purchased at Home Depot. It's more than I need, but it works fast. The compressor has a tire gauge built into the valve just like you would find at a gas station.
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Old 09-01-2015, 09:31 AM   #10
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And some of us have both, a small 110v compressor (+ Honda 2000) and a small 12v, that's what I carry.



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Old 09-04-2015, 07:36 AM   #11
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So, what actual "tire pressure" do you normally use ?? Thanks~
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Old 09-04-2015, 07:54 AM   #12
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Quote:
Originally Posted by 53flyingcloud View Post
So, what actual "tire pressure" do you normally use ?? Thanks~

I use 68 in my Michelins, 16". Seems like most guys use more though. I have a 27 FC, and don't want to stiff of a ride, so less pressure, but I'm not a tire expert.


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Old 09-04-2015, 11:23 AM   #13
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Originally Posted by 53flyingcloud View Post
So, what actual "tire pressure" do you normally use ?? Thanks~
Your absolute minimum pressure should be the pressure needed to carry the actual load on the tires.
Few RVs have the load split evenly between axles PLUS the load on any one axle is seldom split 50/50 side to side.
You can't estimate this and can only learn by either using individual tire position scales or following the various published guides on how to calculate tire loading.

The minimum pressure needed is the pressure published in the Load/Inflation tables.

Now if you want to lower the Interply Shear forces that are trying to tear the tire structure apaart you should run the pressure molded on the tire sidewall that is associated with the tire Max load capacity.

If you don't understand "Interply Shear" and why higher is bad for tires, I suggest you Google
Interply Shear RV tire
to learn more


Before you say you don't need to check your weight you need to remember that a majority of RVs have one or more tire and/or axle in overload.

Until you confirm your actual load the minimum inflation I would suggest in trailer application is the inflation shown on the tire Placard.
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Old 09-04-2015, 12:57 PM   #14
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65# of pressure in the tires per the placard on the side of the trailer-
I have TPMS on the trailer tires, too.
Small 12 volt compressor- takes a long time but gets the job done- even a high pressure bicycle pump-
Another option if you can find it is service stations with air or tire shops/repair shops.
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