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Old 09-15-2010, 06:11 AM   #15
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I understood that tire pressure was a function of load as opposed to pumping them up to the max. Here are two websites that chart pressure vs. load for RV tires.

http://www.goodyear.com/rv/pdf/rv_inflation.pdf

Michelin North America RV Load & Inflation Tables

The Storage section of the original post conflicts with itself:

The ideal storage for trailer tires is in a cool, dark garage at maximum inflation.


For long term storage, put the trailer on blocks to take the weight off the tires. Then lower the air pressure and cover the tires to protect them from direct sunlight.


I store mine at low pressure.
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Old 09-15-2010, 08:10 AM   #16
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dont know if this is right or not ,but hit a pothole with my rear gym st tire and caused a bubble.decided to replace rear axle tires with e rated maxxis tires.now run the front axle gym d rated tires at 65 psi and run the e rated maxxis tires at 70 psi on back axle.when d rated tires need replacing ill move the e rated tires to the front axle and put new e rated tires on the back axle.trailer feels much better with this setup then before with the 4 d rated gyms.tire man told me this was fine as long as i kept inflation close on on all 4 tires and didnt mix load ranges on the same axle.
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Old 09-15-2010, 09:02 AM   #17
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how about rotating the as spare.? doea anbody rotate the spare onto the as and when? or not at all?
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Old 09-15-2010, 10:07 AM   #18
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dont know if this is right or not ,but hit a pothole with my rear gym st tire and caused a bubble.decided to replace rear axle tires with e rated maxxis tires.now run the front axle gym d rated tires at 65 psi and run the e rated maxxis tires at 70 psi on back axle.when d rated tires need replacing ill move the e rated tires to the front axle and put new e rated tires on the back axle.trailer feels much better with this setup then before with the 4 d rated gyms.tire man told me this was fine as long as i kept inflation close on on all 4 tires and didnt mix load ranges on the same axle.
The tires on the front and rear axles, "MUST" be the same exact size.

Measure the overall width of each brand tire. Tire widths between brands are not always the same.

If you find a difference in dimensions, then the larger of the tires will carry more weight that they should, as well as the smaller tires will carry less weight than they should.

This can set up a sway condition, but most importantly, one axle can then be overloaded that is using the larger tires.

That can be damaging to the axle rubber rods, and the tires as well.

Andy
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Old 09-15-2010, 11:36 AM   #19
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Driftless - Our new 2010 Dodge Ram 1500 came with LT tires on it. In the past, I have always had sidewall problems with P metric tires on pickups. The sidewalls are thinner and more prone to puncture that the LT tires. But then again, this might be a function of my actually using my pickups off of the pavement! We do a lot of miles on gravel and dirt roads, both with and without a trailer of some type. Aired up to the proper presssure, I don't notice any difference in ride between the P and LT tires. But then again, it is a pickup. I have also towed a very heavy steel four horse trailer with LT tires on it for many miles over all types of roads with virtually no tire problems. That is one reason that I changed the 15" ST 's on our 20' single axle Safari SE to 16" LT tires. Just my two cents worth.
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Old 09-15-2010, 06:51 PM   #20
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trailer tire facts or pipe dream
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Old 09-15-2010, 07:21 PM   #21
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Driftless - Our new 2010 Dodge Ram 1500 came with LT tires on it. In the past, I have always had sidewall problems with P metric tires on pickups. The sidewalls are thinner and more prone to puncture that the LT tires. But then again, this might be a function of my actually using my pickups off of the pavement! We do a lot of miles on gravel and dirt roads, both with and without a trailer of some type. Aired up to the proper presssure, I don't notice any difference in ride between the P and LT tires. But then again, it is a pickup. I have also towed a very heavy steel four horse trailer with LT tires on it for many miles over all types of roads with virtually no tire problems. That is one reason that I changed the 15" ST 's on our 20' single axle Safari SE to 16" LT tires. Just my two cents worth.
Hmmm, so you are a tire engineer?
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Old 09-15-2010, 10:09 PM   #22
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Arrowstream

Thanks for posting the load/inflation information, but I have some comments/questions on the tables.

1. The Michelin tables are not very useful for Airstream trailer owners since the smallest wheel diameter listed is 16". Most Airstreams are 15".

2. There are letters in parenthesis next to the inflation pressures that are in bold print. These range from B to G. What does this mean?

3. The table lists the load capacity for various inflation pressures. Do you match the load that the tire is carrying to the inflation pressure? For example, if my trailer has ST205/75R15 tires and my trailer weighs 4,280# then the tire load is only 1,070#. So do I only inflate my tires to 20 psig? Or do I inflate to 50 psig where the load capacity is 1820(C) and have some margin? I am confused.

Seems like there is a lot of conflicting information from the folks that should know: Airstream, Tire distributors and tire manufacturers.

Dan
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Old 09-16-2010, 07:26 AM   #23
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andy,thanks for clarifying my situation.i did the measurements and the tires between the d and e rated are the same size and width.will be taking a trip to oc md soon,and will keep an eye on any sway.if need be ill replace the front axle with the e rated tires before going to fla in the fall.
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Old 09-16-2010, 08:47 AM   #24
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DSRTGRLS,

I rotate my spare. Also, I my Dexter Axle manual it says you can use ST or LT tires so long as them are the same or greater LR for the axle.

Mark
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Old 09-16-2010, 09:48 AM   #25
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Hello Dan, the B thru G lettering would be for footnotes (that weren't included in the pdf). I guess I'll have to look further to see what they meant. The pressures given were the minimum required to carry the load, not the ideal pressure. Over inflation will give you a harder ride and less traction. In addition to inflating the tires to the recommended pressure by the vehicle manufacturer, another check that I've done is to wet the tire, roll forward and check the footprint.
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Old 09-16-2010, 02:21 PM   #26
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Ahab, nope, I am not an engineer, just a poor country hick that has towed a variety of trailers lots of miles on lots of bad roads. Again, it is just my 2 cents worth, but I have had very good luck using LT tires on my trailers and tow vehicles.
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Old 09-17-2010, 09:19 AM   #27
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Spoke to Chris on this subject yestrday. I asked if he could clear up all this tire confusion for me. He smiled and said "no". We then had a discussion.

AS offers 15" LRD, 15" LRE, and 16" LT as, not a recommendation, but a customer offering. He would not recomend one over the other, but I asked what he would do if he had my trailer. He replied, 15"LRE at 65 PSI. (I'm at 8500 pounds, loaded, hitched and ready to go). Guess I'll move up from 60psi to 65.
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Old 09-20-2010, 01:03 PM   #28
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Originally Posted by dznf0g View Post
Spoke to Chris on this subject yestrday. I asked if he could clear up all this tire confusion for me. He smiled and said "no". We then had a discussion.

AS offers 15" LRD, 15" LRE, and 16" LT as, not a recommendation, but a customer offering. He would not recomend one over the other, but I asked what he would do if he had my trailer. He replied, 15"LRE at 65 PSI. (I'm at 8500 pounds, loaded, hitched and ready to go). Guess I'll move up from 60psi to 65.
15" LRE is your best bet. Good Choice.
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