Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-19-2012, 07:40 AM   #155
CapriRacer
 
CapriRacer's Avatar
 
I'm in the , US
Join Date: Sep 2012
Posts: 624
Quote:
Originally Posted by rodsterinfl View Post
Wow. Ok, for those that still have the trailer tires; I have Tomax 15" D Rated tires that have a 65psi maximum cold pressure on the side of the tire. According to Mojo, I am to inflate them to 65psi. Sounds logical. I decided to go to 60psi. I want to make sure that I do not over inflate them because of temperature........
Tires are designed to be able to withstand the pressure buildup due to operating temperature - and then some. You should have used the 65 psi.

If you are worried about the difference in pressure due to the change in ambient temperature - again, there is plenty of reserve that you really don't have to worry about it - especially considering that under-inflation is much, much more of a concern.
__________________

__________________
CapriRacer is offline   Reply With Quote
Old 11-23-2012, 04:23 PM   #156
Rivet Master
 
switz's Avatar

 
2014 31' Classic
2015 23' International
2013 25' FB International
Apache Junction , Arizona
Join Date: Sep 2012
Posts: 4,799
Images: 8
The California AS dealer (service manager with over 30 years AS experience) suggested 60 psi in the Fall (CA and AZ) and run 55 psi in the summer in AZ. These numbers are for stock GYM tires on a Int'l 25FB that has sticker GVW of 7,300 pounds.

Reading this article has left a new owner confused. I did see new 16" wheels and appropriate Michelin tires at JC this fall and they would gladly retrofit those 16" tires and wheels for several thousand dollars. They also have a disk brake conversion that is very expensive. Going the16" route raises the height of the trailer thus impacting how my Hensley Arrow would interface to my TV.

Thanks for the discussion.
__________________

__________________
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC

TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell

2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels
switz is offline   Reply With Quote
Old 11-25-2012, 10:04 PM   #157
Vintage Kin
 
slowmover's Avatar
 
Fort Worth , Texas
Join Date: Nov 2006
Posts: 7,603
Images: 1
Quote:
Originally Posted by switz View Post
The California AS dealer (service manager with over 30 years AS experience) suggested 60 psi in the Fall (CA and AZ) and run 55 psi in the summer in AZ. These numbers are for stock GYM tires on a Int'l 25FB that has sticker GVW of 7,300 pounds.

Reading this article has left a new owner confused. I did see new 16" wheels and appropriate Michelin tires at JC this fall and they would gladly retrofit those 16" tires and wheels for several thousand dollars. They also have a disk brake conversion that is very expensive. Going the16" route raises the height of the trailer thus impacting how my Hensley Arrow would interface to my TV.

Thanks for the discussion.
Leave the confusion aside a moment. If the TT were equipped state-of-the-art (antilock disc brakes plus "better" tires/wheels) and the TV had the best hitch . . . what would be the percentage cost increase to the pair of vehicles at the outset? I find this avenue more productive for investigatory reading. That the factory long ago quit being a leader in TT performance is a take-away from that point-of-view. Were these production line standard then the cost would be moot.

The tires have to translate all of the above. The less they are called upon to perform to their outmost limits is crucial. The above addresses this.

Where the rubber truly meets the road.

FWIW, I've had to exchange my H/A stinger twice. About to do it again (different hitch receiver height, and other differences). Proper re-adjustment isn't onerous.

Good luck

.
__________________
1990 35' Silver Streak Sterling; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 9-cpm solo, 15-cpm towing
Sold: Silver Streak Model 3411
slowmover is offline   Reply With Quote
Old 11-27-2012, 07:45 PM   #158
3 Rivet Member
 
BlackAces's Avatar
 
Taylors , South Carolina
Join Date: Nov 2012
Posts: 119
Quote:
Originally Posted by Morgan guy View Post
I have a 2007 AS Classic 27'. It has a GVWR of 9000 lbs. I havve 4 Maxxis load range E tires rated at a capacity of 2830 lbs/ 80 Psi, for a total load of 11,320 lbs. With an excess capacity of 2,320 lbs, I would like to run a lower air pressure than 80 lbs to give a softer ride to the trailer. Does anyone know how the pressure adjustment affects the load capacity, in other words, what can I safely lower the pressure. The label on the trailer says 65 lbs but doesn't reference what load range of tire.

When increasing load capacity with ST tires, itís normally to prevent early tire failures, which the extra load capacity helps insure against.

Maxxis supports the vehicle manufacturers recommended tire pressures 100%. Had you used LT tires for your upgrade you could have used the industry standards and set a new recommended tire pressure. However, Maxxis will only support the pressures for your (ST) LRE tires that are recommended by the vehicle manufacturer. So, until you talk with someone at Airstream authorized to set new tire pressures for your upgrade you should air them to 80 psi. Maxxis will not honor the warranty without documentation.

I had a long talk with the Maxxis East Coast representative about this very subject not long ago. His name is Shawn Brennan and his business phone number is 687-407-6772.


BlackAces
__________________
BlackAces
USN - RET - PDRL
DoD & SSA - RET
BlackAces is offline   Reply With Quote
Old 01-09-2013, 07:04 PM   #159
2 Rivet Member
 
2005 19' Safari
Inyokern , California
Join Date: Aug 2008
Posts: 23
Maximum Tire Inflation

My 19' Safari Bambi takes ST225/75 R15 D-range tires with a 65 psi max inflation. I have noticed that the center of the tread wears out before the edges, creating a visible depression in as little as 3K miles. Would it be worth it to run the Marathons at 60 psi instead of 65?
__________________
richcrest is offline   Reply With Quote
Old 01-09-2013, 09:09 PM   #160
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
Quote:
Originally Posted by richcrest View Post
My 19' Safari Bambi takes ST225/75 R15 D-range tires with a 65 psi max inflation. I have noticed that the center of the tread wears out before the edges, creating a visible depression in as little as 3K miles. Would it be worth it to run the Marathons at 60 psi instead of 65?
The tire maximum rating, is exactly that.

That pressure should be used when you have loaded the tires to the maximum, and not "just because".

Normally, for a moderate load with load range "D" tires, a pressure of 50 to 55 PSI, will get the job done, and the tires will wear evenly, assuming that the running gear has been properly balanced.

Andy
__________________
Inland RV Center, In is offline   Reply With Quote
Old 01-09-2013, 11:07 PM   #161
3 Rivet Member
 
BlackAces's Avatar
 
Taylors , South Carolina
Join Date: Nov 2012
Posts: 119
Quote:
Originally Posted by Inland RV Center, In View Post
The tire maximum rating, is exactly that.

That pressure should be used when you have loaded the tires to the maximum, and not "just because".

Normally, for a moderate load with load range "D" tires, a pressure of 50 to 55 PSI, will get the job done, and the tires will wear evenly, assuming that the running gear has been properly balanced.

Andy
According to the RMA the tires on that trailer would be considered flat at less than 52 psi if the tire placard recommendation is for 65 psi.

The vehicle manufacturer sets those tire pressures, not their representatives.

If dealers would learn more about the regulations and insure that information was passed on to their customers there surely would be less complaints and/or tire failures on RV trailers.

Here is a very useful reference for the scales. Itís from a major tire dealer. It will also tell you to NEVER use less tire pressure than what is found on the tire placard. Kind of a moot point if the tire placard is already recommending the maximum air pressure found on the tireís sidewall. Best thing to do then is move your cargo around to get a better load distribution to all tires.

http://www.trucktires.com/bridgeston.../WeighForm.pdf

BlackAces
__________________
BlackAces
USN - RET - PDRL
DoD & SSA - RET
BlackAces is offline   Reply With Quote
Old 01-10-2013, 03:18 AM   #162
Rivet Master
 
switz's Avatar

 
2014 31' Classic
2015 23' International
2013 25' FB International
Apache Junction , Arizona
Join Date: Sep 2012
Posts: 4,799
Images: 8
I am in the process of acquiring a new TV. The factory installed Michelin LT265/70R17E tires are rated 3,195 pounds @ 80 psi.

The recommended tire pressure on the rear is 70 psi. The rear axle is rated 6,010 and the tire at that pressure is rated 3,005 (x2 = 6010).

The front axle is rated 5,500 pounds. The recommended tire pressure on the front tires is 60 psi. The tire at that pressure is rated 2,760 (x2 = 5,520).

Maximum pressure is not always used.
__________________
switz is offline   Reply With Quote
Old 01-10-2013, 08:49 AM   #163
Vintage Kin
 
slowmover's Avatar
 
Fort Worth , Texas
Join Date: Nov 2006
Posts: 7,603
Images: 1
Maximum pressure is not always used

TT's are always max pressure. The TV's we use to pull them are still Load vs. Pressure.
__________________
1990 35' Silver Streak Sterling; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 9-cpm solo, 15-cpm towing
Sold: Silver Streak Model 3411
slowmover is offline   Reply With Quote
Old 01-10-2013, 09:19 AM   #164
Rivet Master
 
dkottum's Avatar
 
2012 25' Flying Cloud
Battle Lake , Minnesota
Join Date: Jun 2009
Posts: 7,716
Sure makes it easy when everybody agrees.

doug k
__________________
dkottum is offline   Reply With Quote
Old 01-10-2013, 10:36 AM   #165
Don't forget your cat nap
 
Ag&Au's Avatar
 
Port Orchard , Washington
Join Date: May 2009
Posts: 4,464
Images: 1
Quote:
Originally Posted by switz View Post
I am in the process of acquiring a new TV. The factory installed Michelin LT265/70R17E tires are rated 3,195 pounds @ 80 psi.

The recommended tire pressure on the rear is 70 psi. The rear axle is rated 6,010 and the tire at that pressure is rated 3,005 (x2 = 6010).

The front axle is rated 5,500 pounds. The recommended tire pressure on the front tires is 60 psi. The tire at that pressure is rated 2,760 (x2 = 5,520).

Maximum pressure is not always used.
It has been posted many times in several threads lately that you cannot compare the same tires when used on tow vehicles with use on multi axle trailers. These posts include some by more than one tire engineer. Multi axle trailers cause significant sideways forces to be placed on tires when the vehicle turns. This is a fact, in spite of the non engineers who dispute it based on hearsay or "experience". These forces are not applied to tow vehicle tires or to single axle tires to any significant extent. Therefor usage recommendations for truck tires on trucks or SUVs cannot be carried over to the same tires used on multi axle trailers.

Regarding the post that resurrected this thread:

"My 19' Safari Bambi takes ST225/75 R15 D-range tires with a 65 psi max inflation. I have noticed that the center of the tread wears out before the edges, creating a visible depression in as little as 3K miles. Would it be worth it to run the Marathons at 60 psi instead of 65?"

Since I am guessing your trailer is a single axle trailer, lowering the pressure some would seem to me to be a way of curring the uneven wear you are talking about. However, any reduction in pressure will increase the side wall temperature. It is that temperature that will destroy a tire. You must decide if making the wear more even is worth even a slight increase in risk of sidewall failure.

Ken
__________________
Ag&Au is offline   Reply With Quote
Old 01-10-2013, 01:49 PM   #166
3 Rivet Member
 
BlackAces's Avatar
 
Taylors , South Carolina
Join Date: Nov 2012
Posts: 119
Quote:
Originally Posted by switz View Post
I am in the process of acquiring a new TV. The factory installed Michelin LT265/70R17E tires are rated 3,195 pounds @ 80 psi.

The recommended tire pressure on the rear is 70 psi. The rear axle is rated 6,010 and the tire at that pressure is rated 3,005 (x2 = 6010).

The front axle is rated 5,500 pounds. The recommended tire pressure on the front tires is 60 psi. The tire at that pressure is rated 2,760 (x2 = 5,520).

Maximum pressure is not always used.
The procedure the vehicle manufacturer uses for setting the recommended tire pressures for your truck tires is much different than setting recommended tire pressures for RV trailers. By DOT regulation your truck tires must be provided with a set amount of load capacity reserves. That process is accomplished by selecting tires that will provide ample load capacity to accomplish the task.

The only reserve load capacity you will receive for your RV trailer tires will be provided by the vehicle manufacturer. As the regulation is currently written you can receive tires rated at 2000# on 4000# certified GAWR axles.

Because ST tires are designed to be operated at 100% of their maximum pressure rating, trailer manufacturers take advantage of that and use as much of the tires load capacity as possible by setting their recommended tire pressures at the maximum amount.

BlackAces
__________________

__________________
BlackAces
USN - RET - PDRL
DoD & SSA - RET
BlackAces is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Safe Tire Pressure Morgan guy Tires 165 01-10-2013 01:49 PM
02/12: New Tire Discussion on Woodalls: LT versus ST and more. slowmover Tires 128 04-10-2012 06:09 PM
Putting a safe in 2012 27' FB Int Jordanparson General Interior Topics 5 02-24-2012 11:33 PM
Bolt pattern & tire size for 68' Ambassador silverwoman Wheels, Hubs & Bearings 3 02-16-2012 10:36 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 01:33 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.