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Old 08-19-2016, 07:08 AM   #1
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What pressure to start with

Just got new 25FB FC. It has the GYM with 65psi max on the side. The AS placard has 65psi too. After a short trip I checked the pressures and they all were around 55. Now that we have AS loaded, estimating no more than 600-800 lbs, what should it air them up to? I have a TPMS coming in today so will install before next trip.
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Old 08-19-2016, 07:20 AM   #2
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I would run full pressure . Lower pressure leads to higher temps that lead to tire failure. Go to the forum on tires it has lots of info on brands and potential problems of some of them .Enjoy the trailer
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Old 08-19-2016, 07:23 AM   #3
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65 is what Goodyear and Airstream both recommend. That's cold pressure. If yours showed 55 after driving, they are too low.
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Old 08-19-2016, 07:39 AM   #4
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We always run our GYM's at 65 psi on our two Airstreams, and had TPMS, tires worked fine.

Because of reliability concerns we eventually threw out the GYM's and TPMS, upgraded to 16" Michelin tires. Sidewall has 80 psi max but we don't need that much load capacity, so run these at 65 psi for a better ride.
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Old 08-19-2016, 11:39 AM   #5
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Quote:
Originally Posted by dblee1950 View Post
Just got new 25FB FC. It has the GYM with 65psi max on the side. The AS placard has 65psi too. After a short trip I checked the pressures and they all were around 55. Now that we have AS loaded, estimating no more than 600-800 lbs, what should it air them up to? I have a TPMS coming in today so will install before next trip.
Go to the nearest truck stop when you are fully loaded and weigh each trailer axle. Use the higher of the two weights and divide by two to get the load on each tire and look that load up in the tire manufacturer's load table on their web site or go to a tire dealer and get them to look up the specified pressure for that load. If you can weigh the load on each tire so much the better. Use the highest of the 4. I usually add a couple of pounds for added safety but the tire manufacturer should have put a safety factor in their numbers. I have been running GYM load range D tires on my '67 for many years at 43 psi with no problems. Max pressure is not always necessary or desirable. I get a pretty smooth ride.
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Old 08-19-2016, 03:18 PM   #6
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I messed with this for years, I finally did as so many say, put in 65 PSI when cold. The trailer pulls easier, and thing ride just as well in the trailer. I am sure you will get better wear from your tires. If mine start wearing in the middle, I will take a little out, so far they are wearing perfect.
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Old 08-19-2016, 03:53 PM   #7
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You start by using the tire MANUFACTURES recommended pressure as per the chart. The pressure printed on the side of the tire has nothing to do with reality.

My tire have 85 lbs printed on the tire. I run 45 and that is over inflated but I do it so I can run in on only 5 tires if necessary.
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Old 08-19-2016, 05:36 PM   #8
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My 30' FC came with 15" Michelin 'P' tyres and max sidewall is 50 psi. And CanAm says to use that figure cold.
My avg. Loading is about 7800-8000 lbs. And driving at 100-110 klicks on a 30C+ day doesn't seem to bother them. So says my 'Royal Canadian' feeler paw, and an 'NVision TPMS.

Go with the ' so called 'pros' recommendations and if possible get it in writing.
(Remember to CYA.)
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Old 08-22-2016, 06:08 AM   #9
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Originally Posted by MelGoddard View Post
My 30' FC came with 15" Michelin 'P' tyres and max sidewall is 50 psi. And CanAm says to use that figure cold.
My avg. Loading is about 7800-8000 lbs. And driving at 100-110 klicks on a 30C+ day doesn't seem to bother them. So says my 'Royal Canadian' feeler paw, and an 'NVision TPMS.

Go with the ' so called 'pros' recommendations and if possible get it in writing.
(Remember to CYA.)
Maybe it is different in Canada but I would never run "P" tires on my trailer. They don't have the sidewall strength to withstand sharp turns esp. turning while backing.
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Old 08-22-2016, 06:13 AM   #10
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That's what AS puts on some models.
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Old 08-22-2016, 06:47 AM   #11
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Here is a copy of the GYM inflation table. We run 55 psi cold (as recommended by Can-Am) at our loaded weight on GYM ST 225/75R15. It generally climbs to 60 psi and 90 deg F when running in 30 deg C ambient as shown on our TST 507 TPMS. (Too high a pressure may cause excessive rough ride for the trailer and contents.)

P.S. I also monitor my spare tire.
Attached Files
File Type: pdf Goodyear RV Tire Inflation.pdf (85.6 KB, 32 views)
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Old 08-22-2016, 08:37 AM   #12
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A Great Question

Tire inflation is one of the most important issues out there. It is not an easy answer since there are so many variables to deal with.

Basically a tire is "under inflated" when the pressure inside cannot carry the weight it is asked to carry. You need to know the weight of your trailer as it goes down the road. Weighing it is the best way but you can use the GVWR as a good estimation. Look at a chart like this,

http://www.maxxis.com/trailer/traile...nflation-chart

and inflate the tire so the weight rating is large enough to carry the trailer and have a decent buffer past that. I ran LRD Maxxis tires on my 25FB that has a GVWR of 7200. In the chart (and printed on the sidewall) the carrying capacity @ 65 was 2540. Multiply that by 4 to get a total capacity of 10,160 pounds. I felt comfortable with that amount so I ran my tires at 60-65. I have weighed my trailer a few times and I am usually running at 6500 lbs. Using 10,000 as a tire weight capacity estimate I have a 53% margin (if you are an engineer) or a 35% margin (if you are a business major).

I just replaced these tires with a LRE tire that will take 80 lbs of pressure for a weight rating of 2830 per tire. I will run them at 70 and still have more capacity than I had with my others.

When a tire has less pressure than what is on the sidewall it will flex more. I suppose this is the issue that makes people say the trailer rides better. That might be true but I don't think I could tell. I do know that the more flexing the more heat will be produced. It is the heat that does the damage. While I plan to run mine at 70, I will inflate them to the max when traveling in extremely hot conditions.
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Old 08-22-2016, 08:59 AM   #13
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Well, I set my tires to 65 per placard and installed my tpms. After two days on the road, psi only went to 72, highest, with temp up to 100, at times. When it rained, everything went down nicely. Will continue to monitor, tpms helps me keep an eye on tires for a little reassurance until I'm ready to go the 16", Michelin E route or better.
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Old 08-22-2016, 09:28 AM   #14
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Completely agree that the load chart is worth using along with knowing what weight is actually on your trailer's wheels.

We have an International Signature 27FB and for us 65PSI cold is too high.

We generally start at 58-60 cold and our tires have served us well up to now. (We realize we are not a statistically significant sample, btw.)

We used to be proud members of the 65PSI cold club. Then we met the Mojave Desert. Not a happy moment when the TPMS was reading out 70+ PSI and when we stopped for a break the sidewalls appeared to be bulging uncomfortably against the structure of the tire. We spent some quality time with a Goodyear dealer in Victorville, CA, who told us the tires were fine but 65 cold was clearly too high for our use and we should start out around 58. We've done that ever since and everything's been fine thus far.

Oh and yes, we're big fans of using a TPMS to monitor all 5 tires (including the spare).

Hope that helps.

Quote:
Originally Posted by Adventure.AS View Post
Here is a copy of the GYM inflation table. We run 55 psi cold (as recommended by Can-Am) at our loaded weight on GYM ST 225/75R15. It generally climbs to 60 psi and 90 deg F when running in 30 deg C ambient as shown on our TST 507 TPMS. (Too high a pressure may cause excessive rough ride for the trailer and contents.)

P.S. I also monitor my spare tire.
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