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Old 08-03-2011, 02:51 PM   #29
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I have Maxxis tires on my AS and run at max pressure all the time. I have one with a slowwwww leak that I cannot find so I do have to moniter it and add when necessary. I do a lot of miles when we're on the road and the other week coming home from PEI and Maine it was 100+ degrees. If I remember correctly mine are LR C at 50psi. So far so good. I'm sure these tires will time out before they wear out. But we'll see about that. All that said, I do carry a spare and stuff to change it if I need to. Thankfully I have never had to change a tire on the road. ( Knock on wood ).

See ya on the road.
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Old 08-03-2011, 03:17 PM   #30
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The only thing that determines the proper tire pressure is the manufactures load chart.
Proper tire pressure is a function of weight on the tire and nothing else.

I run E rated tires that have a max pressure of 80 psi printed on the tire but I run 45 psi, even that is slightly higher than the chart calls for, because the trailer load on the tires calls for that pressure against the chart. If I ran 80 pounds I would have rivets popping all over the trailer.

Since all tire manufactures have to meet the same standards for a given tire size and type you can use anyone's chart as a reference.

This will give you the correct pressure once you have the axle weight.
http://www.goodyear.com/truck/pdf/da...dInflation.pdf


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Old 08-03-2011, 08:24 PM   #31
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Tire Pressure

Quote:
Originally Posted by HowieE View Post
The only thing that determines the proper tire pressure is the manufactures load chart.
Proper tire pressure is a function of weight on the tire and nothing else.

I run E rated tires that have a max pressure of 80 psi printed on the tire but I run 45 psi, even that is slightly higher than the chart calls for, because the trailer load on the tires calls for that pressure against the chart. If I ran 80 pounds I would have rivets popping all over the trailer.

Since all tire manufactures have to meet the same standards for a given tire size and type you can use anyone's chart as a reference.

This will give you the correct pressure once you have the axle weight.
http://www.goodyear.com/truck/pdf/da...dInflation.pdf


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Hi Howie
I just put 2 Maxxis M8008's on my 20' Safari- they are E rated (2850#) and the recommended pressure is 80 psi. Since my Safari has a dry weight of just over 4,000, should I run them at a lower pressure than recommended?
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Old 08-03-2011, 09:15 PM   #32
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Remember that the maximum rated psi of the wheel should not be exceeded.

The original wheels on my safari are only rated for 65 psi, so I can not safely inflate my new E rated tires to their maximum pressure of 80 psi. I actually run mine at 55 psi.
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Old 08-03-2011, 10:21 PM   #33
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Go on the web

http://www.maxxis.com/Repository/Files/m8008load.pdf

You can find your tire size here and check the recommended pressure. If you are running the 225 75 15 I would run between 45 and 50 lbs.

As mentioned above if the wheel is max rated at 65 lbs you clearly do not want to go above that pressure.
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Old 08-03-2011, 10:45 PM   #34
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Tire Pressure

I checked my manual and the specs say "wheel torque" (max.) in ft pounds is 100 pounds. I don't see a rating for psi. How do I find out what my max wheel rating is for purposes of tire pressure?
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Old 08-04-2011, 06:41 AM   #35
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I have been running the air pressure at maximum psi (65) on my load range D Carlisle tires ST225/75/15. Am i really doing anything wrong?
According to charts for Carlisle, Goodyear and Maxxis I only need to run 30 psi to get buy............ I am running scared of such a light pressure due to heat build up and hearing about so many people having blowouts on a hot day. The tires seem hot enough after leaving the highway. I don't have a thermometer to check the temps but they seem warmer than the truck tires that are not a maximum pressure.
The trailer has 6,100 lbs on the axles. I try not to exceed 70 mph but sometimes you have to keep up with traffic and there is only so much time in a working mans life.
Maybe I think to much about this but what happens when you hit potholes or undulations in the road? Aren't you getting a momentary load increase? Wouldn't a partially inflated tire be more subject to sidewall damage or more potential for blowout due to the sudden increase in load? Would the trailer "wallow around" more when subject to cross winds or dips in the road?





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Old 08-04-2011, 08:54 AM   #36
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Quote:
Originally Posted by Mrs. Bale View Post
I checked my manual and the specs say "wheel torque" (max.) in ft pounds is 100 pounds. I don't see a rating for psi. How do I find out what my max wheel rating is for purposes of tire pressure?

If they are the wheels that came on the trailer new I would call Airstream and ask what the rating is for the tire if they can't come right back with a convincing answer I would ask them who their suppler is and call them. I make the second suggestion because the Customer Support personnel at Airstream are not doing much more than reading from a book and may not have that answer.

If no answer there the rating should be stamped on the back side of the wheel. To read it you will have to remove the wheel, clean the back side and you should find it.
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Old 08-04-2011, 09:09 AM   #37
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in my experience i've found that running the at max rated pressure is only good for gas mileage and finding every crack in the road.

max tire pressure is not good for a comfortable ride or TRACTION.

i don't think is great for the sidewalls on bad roads but i have nothing to support that.

i did find an interesting reference for tire temps with under/over inflation showing higher temps in the center with overinflation.

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Old 08-04-2011, 09:26 AM   #38
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Quote:
Originally Posted by Mrs. Bale View Post
I checked my manual and the specs say "wheel torque" (max.) in ft pounds is 100 pounds. I don't see a rating for psi. How do I find out what my max wheel rating is for purposes of tire pressure?
When I removed my wheels to clean them up when I put on the new tires, I saw the maximum PSI stamp. It is stamped into the metal on the back side of the wheel, under all the gunk and road grime. (on mine they are actually raised letters in the metal)
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Old 08-04-2011, 09:32 AM   #39
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What was the max psi? jim
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Old 08-04-2011, 09:58 AM   #40
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I am under the impression that Airstream will tell you to go with the maximum air pressure for the tire. When I had load range E tires mounted there, they wanted to put 80 lbs. in them and I told them to put 68. I don't remember what they did and whether I let air out at the Terraport.

The manuals say to run at 65 for Load Range D. In recent years I think the OEM tires have all been LR D. It's possible the lightest trailers are LR C, but it may be cheaper to only stock one type at the factory.

So, Crispy', following the tables, you are right. But how long have you been using 65 psi and how are the tires wearing? If the tread center is more worn, then that says overinflation. You could reduce pressure by increments to see how things go. And you can call the tire manufacturer to see what they say. Use an infrared temperature monitor to check tire temps for excessive heat.

If you follow tire threads, two things stand out (actually more than 2, but let's forget the rest for the moment): 1. underinflation is very, very bad and 2. Airstream recommends 65 psi.

It's easy to recommend maximum air pressure when you make trailers of all sorts of weights and various loads on each tire. When you publish a variety of manuals, you want them to be as much the same as possible, so the simple thing is to recommend 65 psi. Eventually it becomes, through repetition, wisdom. Thinking is the remedy for such wisdom. I had 65 psi in the OEM tires (I hadn't been thinking)—I don't recall them wearing unevenly, just wearing fast.

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Old 08-04-2011, 10:41 AM   #41
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With the loads we carry we inflate our GYM's to 55 psi. 65 psi would be if we were at max load. See attached chart.
Attached Files
File Type: pdf tire inflation table.pdf (86.7 KB, 32 views)
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Old 08-04-2011, 10:56 AM   #42
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Quote:
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What was the max psi? jim
65 psi
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