Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-19-2014, 09:49 PM   #29
Rivet Master
 
SteveH's Avatar
 
2005 39' Land Yacht 390 XL 396
Common Sense , Texas
Join Date: Sep 2007
Posts: 5,311
Quote:
Originally Posted by DFlores View Post
OK, so can I run my new Goodyear Wrangler HT's at the max tire pressure of 65 psi to get the most weight capacity or should I go 85 to 90 % of rated weight capacity


Sent from my iPhone
David & Diane
Not only will max air pressure give you the most weight capacity, it will also give you the most stability.
__________________

__________________
Regards,
Steve
SteveH is offline   Reply With Quote
Old 11-20-2014, 06:30 AM   #30
CapriRacer
 
CapriRacer's Avatar
 
I'm in the , US
Join Date: Sep 2012
Posts: 630
Quote:
Originally Posted by DFlores View Post
OK, so can I run my new Goodyear Wrangler HT's at the max tire pressure of 65 psi to get the most weight capacity or should I go 85 to 90 % of rated weight capacity


Sent from my iPhone
David & Diane
We need a lot more detail to answer that question.

1) Are we talking about your trailer or your tow vehicle?

If the tow vehicle, then you need to find the vehicle tire placard on the driver's door - and if the tire size you are currently using is the same as what is listed there, use that pressure. If a different tire size is being used, then we need to recalculate.

2) If we are talking about your trailer, then tell us more about it. Have you weighed it? Did you change tire size and/or type?

Details, please.
__________________

__________________
CapriRacer is offline   Reply With Quote
Old 11-20-2014, 08:19 AM   #31
Rivet Master
 
DFlores's Avatar
 
1968 22' Safari
Austin , Texas
Join Date: Sep 2011
Posts: 573
Images: 3
Quote:
Originally Posted by CapriRacer View Post
We need a lot more detail to answer that question.

1) Are we talking about your trailer or your tow vehicle?

If the tow vehicle, then you need to find the vehicle tire placard on the driver's door - and if the tire size you are currently using is the same as what is listed there, use that pressure. If a different tire size is being used, then we need to recalculate.

2) If we are talking about your trailer, then tell us more about it. Have you weighed it? Did you change tire size and/or type?

Details, please.

I am completing a shell off renovation, the original weight on the 68 single axle Safari is 3420 lbs, for this exercise let's use 3500 lbs. I did change tire size, the new tires are Goodyear Wrangler HT in 215 75 15, these are light truck tires with a "D" load rating.


Sent from my iPhone
David & Diane
__________________
DFlores
David & Diana
DFlores is offline   Reply With Quote
Old 11-21-2014, 06:57 AM   #32
CapriRacer
 
CapriRacer's Avatar
 
I'm in the , US
Join Date: Sep 2012
Posts: 630
Quote:
Originally Posted by DFlores View Post
I am completing a shell off renovation, the original weight on the 68 single axle Safari is 3420 lbs, for this exercise let's use 3500 lbs. I did change tire size, the new tires are Goodyear Wrangler HT in 215 75 15, these are light truck tires with a "D" load rating.


Sent from my iPhone
David & Diane
OK, so let's do the math:

First let's clarify the 3500# value as the tire loading, not the GVW. And since it is an axle value, we'll add 10% to account fr side to side loading variation.

So each tire would be carrying 1925#. I think tires shouldn't be loaded more than 85% of their rated capacity - so that means the inflation pressure has to generate at least a 2265# load carrying capacity.

The tire is rated for 2096# at 65 psi, so I think it is running at 92% of its rated capacity.

Personally, I don't like that value, but to answer your question, you need to be running at 65 psi.

And just to check this out: You should run a pressure buildup test when you get the rig running. The test consists of checking the inflation pressure BEFORE you start for the day (65 psi), then check it after an hour of high speed towing. You should get no more than 72 psi. If you get more than that, you either need to slow down, or get a tire with more load carrying capacity. As a followup to be sure you have captured the max pressure buildup, check after a second hour of running.
__________________
CapriRacer is offline   Reply With Quote
Old 11-21-2014, 08:51 AM   #33
Rivet Master
 
SteveH's Avatar
 
2005 39' Land Yacht 390 XL 396
Common Sense , Texas
Join Date: Sep 2007
Posts: 5,311
Years ago when my father started Airstreaming, there were no such things as "Trailer Tires", and everyone used 7.00X15 bias ply truck tires. And, although they didn't last too many miles because the tread wore out quickly, it was very rare to have a tire fail.

Now days the tread on radial trailer tires last a long time, if they don't fail first. The major problem is the amount of damage they will do to the trailer when they do fail. I've heard stories of up to $8,000 damage from a radial trailer tire failure.

Sort of a "Damned if you do, damned if you don't" deal. Wish there was a way around it.
__________________
Regards,
Steve
SteveH is offline   Reply With Quote
Old 11-21-2014, 10:18 AM   #34
Rivet Master
 
DFlores's Avatar
 
1968 22' Safari
Austin , Texas
Join Date: Sep 2011
Posts: 573
Images: 3
Capri,
Thank you for response, will have to weigh the trailer as soon as I can to get real weight.

Thanks again.
__________________
DFlores
David & Diana
DFlores is offline   Reply With Quote
Old 11-21-2014, 06:26 PM   #35
2 Rivet Member
 
1973 31' Sovereign
Boerne , Texas
Join Date: May 2014
Posts: 43
Images: 2
After reading through this (and other) threads, we went ahead and ordered Carlyle ST225/75R15 tires (D load rating) from Discount Tire. Now in the nasty Texas drizzle, my husband has headed over to the Airstream to jack it all up and remove all 4 tires so that they can be taken in for the new ones to be put on. He's a very cautious person, but I'm still praying he doesn't kill himself.
__________________

__________________
Gwendolyn
campindaisy 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
Tires...Tires...Tires Bob Thompson Tires 277 07-30-2015 02:30 PM
Michelin Truck Tires paiceman Tires 95 06-12-2014 10:20 AM
LT truck tires vs trailer tires Jerryb1973 Tires 7 03-07-2011 08:58 AM
Help tires, tires, tires. jimmini Tires 9 10-18-2008 08:54 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:31 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.

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