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Old 03-20-2019, 05:59 AM   #57
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jadatis, to get the OP’s attention, just Quote him/her from an earlier post, instead of using large all caps IMO.

Peter
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Old 03-20-2019, 06:00 AM   #58
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Originally Posted by AlbertF View Post
There are a lot of references to the sticker on the outside of the trailer that says 80 psi, but thatís not what Iím reading in the ownerís manual. It clearly points to using tire manufacturersí load tables to set inflation pressure.

On that basis, my new 22FB requires no more than 55 psi fully loaded.


Iím not 100% sure on this - but if youíre saying that based on cat scale weights of your trailer, I believe your 22FB would require NO LESS than 55PSI. Those load tables are, if I understand correctly, the minimum PSI required for that load - the sidewall max is the max PSI the tire should have cold (which likely coincides with the sticker) since AS doesnít know how youíre going to load and use your trailer. Plenty has been written here about margins, not all tires getting equal weights, speed, etc.

Iím not a tire expert. I did stay at a Holiday Inn last night however, so.....
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Old 03-20-2019, 06:28 AM   #59
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Quote:
Originally Posted by OTRA15 View Post
jadatis, to get the OP’s attention, just Quote him/her from an earlier post, instead of using large all caps IMO.

Peter

Did that in earlyer post , so thougt this might draw more atention.
He has not reacted here since his first post, can be that he gets no mailmessage of new posts.


To AlbertF: did you add 10% for reserve first before looking in the list.
This is to cover unequall load R/L wich is always the case for TT's.

Oh no , in America minimum 10% on pin, and so axle load is 90% of GVWR.
Adding 10% to that 90% gives 99% , is about 100% , so looking back GVWR is also good.
But looking in my made lists , you get about 5psi more so 60psi I estimate will be the advice then.

My goal is to give the tire a minimum deflection, so maximum pressure, at wich gripp is still acceptable and no bumping.
Then if pressure drops in time, or inacurately to high measured, you still ride with save pressure.
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Old 03-20-2019, 10:57 AM   #60
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Quote:
Originally Posted by AlbertF View Post
There are a lot of references to the sticker on the outside of the trailer that says 80 psi, but thatís not what Iím reading in the ownerís manual. It clearly points to using tire manufacturersí load tables to set inflation pressure.

On that basis, my new 22FB requires no more than 55 psi fully loaded.
You are correct,; and I agree!

But as usual, the "facts" don't seem to matter for some of the Forum folks...they will argue till the cows come home!

In my earlier post #42, I shared that I too called GY experts directly this week. Took me talking to 3 different departments/experts, before getting to the real recommendation which was: "the sticker Max Pressure PSI's are meant for most people since "most people" don't know what their rigs weigh. If you know, GY recommends you go by their loading chart for PSI. Makes sense to most of us, doesn't it? (or does it??)

jadatis- Your "charts" are fine as a "guide" but using the MFG recommended PSI's for their particular tire seems to make sense, no?

Some folks here seem to be fine and happy with loosing rivets running MAX or 70+ PSI with their Endurance tires. I also carry extra rivets and a rivet gun. But, I will say, after replacing screws in hinges/latches that stripped out, bedroom closet (with TV) coming loose from ceiling mount, closet door and shower door laying on the floor running 70PSI, I choose to follow the GYE chart. No issues last 6K miles on my 28' FC since I installed these tires last summer and adjusted to recommended 45-50PSI. Anyways, to each his own...hope no one "blows" a tire over this thread!
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Old 03-20-2019, 01:28 PM   #61
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The number 1 reason tires fail - overheating .
The number 1 reason tires overheat - is low air pressure .
Numbers on car , truck , trailer for load - stick with those numbers & match then to the tires .
Number on tires need to match the load & air pressure
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Old 03-20-2019, 06:34 PM   #62
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Just replaced original tires on my 27 FB International and set pressure at 70 PSI . I have read where some run lower pressure, my Marathons where 65 PSI and never had a problem with them for 6 years.
The installer tells me that the Endurance are 10 ply where the Marathons where only 6ply.
What tire pressure at cold do you set yours ?

"Ply Rating" is an old term from the 60's & 70's. You can read the sidewall of your tires and find both the number (many times one) and the material (Polyester) in the tire sidewall.
l "Load Range" is the current term for the tire's ability to contain the inflation pressure with Load Range "E" being the replaceemntfor the old 10 ply rating.


Your installer apparently has not bothered to keep up his/her education and knowledge of tires. You might consider finding a more knowledgable tire dealer.
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Old 03-20-2019, 10:36 PM   #63
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Quote:
Originally Posted by jadatis View Post


To AlbertF: did you add 10% for reserve first before looking in the list.
This is to cover unequall load R/L wich is always the case for TT's.

Oh no , in America minimum 10% on pin, and so axle load is 90% of GVWR.
Adding 10% to that 90% gives 99% , is about 100% , so looking back GVWR is also good.
But looking in my made lists , you get about 5psi more so 60psi I estimate will be the advice then.

My goal is to give the tire a minimum deflection, so maximum pressure, at wich gripp is still acceptable and no bumping.
Then if pressure drops in time, or inacurately to high measured, you still ride with save pressure.

The 22fb has an empty tongue weight of 422 lbs. Water tank, water heater and most storage are ahead of the axle, so loaded tongue weight will be over 600 lbs. With WDH about 450 to 500 lbs will be on the tow vehicle. Typical load per tire should be just over 2000 lbs with trailer at GVWR. 55 psi gives 2270 lbs capacity - a bit more than 10% margin.
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Old 03-21-2019, 04:28 AM   #64
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Endurance Tire pressure on 27FB Int'l

Scaled

Scaled my trailer hitched with full gas tanks and full fresh water is 6130 lbs ready to camp not including the tongue weight


Based on GYE chart with adding a 30 % margin for load shifting flex, my trailer is near 8000 lbs that would make it 2000 LBS per tire= @ 45 PSI
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Old 03-21-2019, 05:30 AM   #65
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Quote:
Originally Posted by LAWBC View Post
Scaled

Scaled my trailer hitched with full gas tanks and full fresh water is 6130 lbs ready to camp not including the tongue weight


Based on GYE chart with adding a 30 % margin for load shifting flex, my trailer is near 8000 lbs that would make it 2000 LBS per tire= @ 45 PSI
What size tire?

Bob
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Old 03-21-2019, 05:58 AM   #66
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I have never seen a tire that did not have the pressure rating embossed on the side of the tire. All you have to do is read what it tells you and inflate to that pressure.
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Old 03-21-2019, 06:45 AM   #67
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Welcome Aboard!! 👍

Tim,
The first thing you will learn here on the Forums...Airstreaming is far more complicated than it appears on the sidewall.

Sweet Streams...
Disclaimer...I do use the sidewall pressure, with slight adjustments from the chart I keep in my head.

Bob
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Old 03-21-2019, 11:13 AM   #68
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Quote:
Originally Posted by LAWBC View Post
Scaled

Scaled my trailer hitched with full gas tanks and full fresh water is 6130 lbs ready to camp not including the tongue weight


Based on GYE chart with adding a 30 % margin for load shifting flex, my trailer is near 8000 lbs that would make it 2000 LBS per tire= @ 45 PSI
Welcom back, take it that you read it all.
Conclusion I took was that AS are exeption to the rule, and have a comfortable reserve in maxload of tires. But sill they give general advice of refence-pressure for TT.
Saw 2020 lbs at 45 psi for ST 225/75R15, so this must be your sise.
Trew it trough my made extra safe calculator, and used the exagerated 30% reserve
D- LOAD ( AT65psi ) gives 50 psi and your new E- load( AT80psi) gave 55 psi.
Also lowered the loadindex by 6 to find max pressure without bumping ( but 30% reserve then bumping) and it still came to D 60psi and E 65 psi.
So higher is absolutely not needed.
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Old 03-21-2019, 01:25 PM   #69
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Sidewalls, charts, safe calculator's...whew.🥴

A simpler rule to follow...if your tires are under inflated, fill them 'til they aren't. 😂

Bob
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Old 03-21-2019, 03:21 PM   #70
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Originally Posted by ROBERT CROSS View Post
Sidewalls, charts, safe calculator's...whew.🥴



A simpler rule to follow...if your tires are under inflated, fill them 'til they aren't.



Bob



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