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Old 12-28-2005, 03:34 PM   #1
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Tire pressure conflict?

Book for my 88 Exella 1000 says tires at 55 psi. Cooper and Marathon say 65psi for my weight etc. Who is right? I noticed when I went from 55 UP to the suggested 65 with Marathons I cracked plastic headlliner in rear. Coincidence?
Love the trailer. Every now and then we wander through a fancy new 5th or a nice box trailer with slides etc. but always end up back in our "old" 29 footer.
Thanks folks.
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Old 12-28-2005, 03:51 PM   #2
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I like to run mine at "max pressure" listed on tire sidewall.
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Old 12-28-2005, 04:38 PM   #3
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hi anniedog and welcome to the forums

lots of threads here on tire pressures for both the t.v and the trailer. also on the load rating symbols (c,d,e) that various trailer tires carry. search a little and you can read your brain full...

what's the rating on your new tires?

my guess is that the tires made/spec'd in '88 may have had a max psi of 55. your new tires must be rated at 65......mine are too.

i agree the newest marathons will run the coolest and be most reliable at the 65psi cold inflation. that's also the pressure that supports their max load rating.

will that vibrate the trailer more? perhaps, but how much and to what degree is this a negative.......only inland andy can tell us for sure.......but he does say........

'safety first garrrrrrrr-un-teed!'

you could do some tinkering......first weigh your trailer/tv at a cat scale and get the axle load figures with full tanks and all your travelin' gear, and your hitch dialed in........if you are at max load for the tire (and not over the trailer max load), then go to 65psi and stop tinkerin'.....

if your fully loaded trailer is some fraction of max and you have a surface temperature sensor.....you could lower cold pressures some; travel 10-20 miles and re measure the temps......as you incrementally reduce tire pressures there will come a point that is tooo low and the tires will get warmer.....that would suggest it's time to re inflate a few psi.....

because properly inflated tires wear better, run cooler, support the load better, provide the best traction and help control/resist sway.........i'd suggest just going to 65psi and spend the extra effort rechecking regularly to make sure they are holding air properly.....

cheers
2air'
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Old 12-28-2005, 04:45 PM   #4
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First you should make sure your tires are properly rated for your trailer weight. Not too much nor too little. Don't get D rated tires when all you need is C, for instance.

After that, I agree with George. Inflate to the max pressure spec on the sidewall.

Low inflation is the number one source of tire failure. With modern tires, and especially for the low milage most trailer tires get, excess center wear from overinflation is not much of a concern.

The primary problem with tires that are more heavy duty than needed is that they tend to ride rough and that can hasten wear and tear problems in the trailer.
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Old 12-28-2005, 05:10 PM   #5
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If you bought the correct tires for your trailer, follow the tire manufacturers specfications for inflation.
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Old 12-28-2005, 08:33 PM   #6
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Accountability

I guess that I would look at accountability, in the event of a failure.

Airstream will likely say - that's the tire manufacturer's responsibility. Sort of like Ford did with Firestone. Airstream makes trailers!

Just my two cents!

Regards,
Henry
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Old 12-29-2005, 02:15 AM   #7
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Tire pressure conflict

Okay folks, I get the drift. Have always inflated to tire mfrs. reccommended for the load and check tire/hib temps regularly. Have blown a couple Marathons but switched to a set of Coopers and no trouble to date. It DOES seem to me our tire makers seem to be having a difficult time making tires that last. I am a NUT about proper inflation etc. and thus really annoyed when an apparently good Marathon blows. The worst part is not the #$%#$ tire....its what it does to my trailer!! HA!
Thanks again.
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Old 12-29-2005, 06:30 AM   #8
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Quote:
Originally Posted by Anniedog
. Have blown a couple Marathons but switched to a set of Coopers and no trouble to date. It DOES seem to me our tire makers seem to be having a difficult time making tires that last. Thanks again.
I switched from Cooper Travel-Tracs to Marathons after a pair of Coopers bit the dust in a spectacular fashion on me. Like everything else, it is using what works best for you. I inflate my tires to the vehicle and trailer manufacturers' specifications, unless it is a Ford Explorer, but that is another story for another thread.
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Old 12-29-2005, 07:54 AM   #9
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Here's a tire inflation chart from Good Year, for their RV tires. It references different tire pressures to max load ratings.
Attached Files
File Type: pdf rv_inflation.pdf (67.4 KB, 101 views)
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Old 12-29-2005, 10:17 AM   #10
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Originally Posted by Leipper
...The primary problem with tires that are more heavy duty than needed is that they tend to ride rough and that can hasten wear and tear problems in the trailer.
I'm channelling "Inland Andy"... balance your wheel assemblies if you're experiencing rough ride... then you can inflate properly without rattling your trailer to pieces.

Andy... uh, ok Tin Lizzie
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Old 12-29-2005, 12:07 PM   #11
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Underinflation is very dangerous...

The important thing to remember is that underinflation is extremely dangerous. The tires overheat and the tread separates. From what I've read, that is what happened with the Ford Explorers and the Firestones. Ford had an inflation value stamped inside the door that was marginal. People would inflate to that marginal pressure, neglect to check the tire pressure for several months, and when they bled down five psi over time, they had an underinflated tire that heated up and separated. Car and Driver tried to replicate thse problems and with proper inflation, could not get a Firestone on an Explorer to blow at any speed. Only by underinflating them could they separate a tire.

All that being said, I think it's wise to trust the tire maker. However, if you really want to know for sure, get an infrared thermometer and try testing your tires. It may be that 55psi is just fine on your rig going 70mph on a 100 deg F day. Pump them to 55psi, take them out on the road for a half hour and get them warm and then quickly pull over and take a reading. Pump them up to 65psi and try the same test. That's how you really know for sure.

There's a large range between ideal, acceptable, and dangerous. You'd probably be OK at 55psi. Don't let them get to 25psi. The only way to really know is to actually test them like I mentioned above.

Good luck and let us know what you come up with.

JG
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Old 12-29-2005, 12:18 PM   #12
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Quote:
Originally Posted by JimGolden
...
All that being said, I think it's wise to trust the tire maker. However, if you really want to know for sure, get an infrared thermometer and try testing your tires. It may be that 55psi is just fine on your rig going 70mph on a 100 deg F day. Pump them to 55psi, take them out on the road for a half hour and get them warm and then quickly pull over and take a reading. Pump them up to 65psi and try the same test. That's how you really know for sure.

There's a large range between ideal, acceptable, and dangerous. You'd probably be OK at 55psi. Don't let them get to 25psi. The only way to really know is to actually test them like I mentioned above.

Good luck and let us know what you come up with.

JG
Jim,


What temperature would you consider appropriate?

Bill
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Old 12-29-2005, 02:14 PM   #13
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I've had great success over the past 3 years and 2 Airstreams doing the 65psi cold with the Marathons. Heat isn't too bad either even in 90 degree ambient temps. I'd stick with what the tire manufact has listed, unless you in fact have the wrong tire for the coach.
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Old 12-29-2005, 03:28 PM   #14
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Jim,


What temperature would you consider appropriate?

Bill
Check the sidewall of all of your tires! It will have a max pressure listed. A C Range tire is usually 55 psi max. for a fully loaded trailer. Many run 55 psi no matter how the trailer is loaded to make sure that the tires are never running under inflated. As long as you are running 53-55 psi cold then you are fine but this would range from a lightly loaded trailer to a fully loaded trailer. I know there are charts out there that show what you can run "psi wise" for different loads. I don't trust the charts because I feel that an underinflated tire can cause you heat problems and failure down the road (no pun intended).

A D Range tire has a max of 65 psi so run your tires 63-65 psi. I can't advise running D Range tires at C Range pressures to limit shock to the coach because I found that probably lead to failure of one of my D Range tires.
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