Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-10-2016, 09:28 AM   #29
rbs
4 Rivet Member
 
rbs's Avatar
 
2015 30' Classic
Decatur , Illinois
Join Date: Apr 2010
Posts: 277
Blog Entries: 2
tires

we replaced the Goodyear Marathons on our previous 25' Classic with the 15" Michelins, and could not have been happier. Literally made the trailer pull and ride so much better, the 80 psi Goodyears were beating the trailer to death. I checked tire temp's constantly until I was convinced they were doing a very good job and nothing to worry about. I am still trying to determine a psi to run in my 16" Michelins on our new Classic.
__________________

__________________
rbs is offline   Reply With Quote
Old 03-10-2016, 10:04 AM   #30
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
We looked at the weight table from Michelin for the 16" LT225/75R16/E LTX M/S2 tire and have selected 75 psi which has a load rating of 2,540 pounds. 70 psi has a 2,440 pound rating. Many are running 72/73 pounds for the 2,500 pound spot.

A TPMS system that displays both pressure and internal temperature (like the Dill 1506-453) is very useful for selecting the best tire pressure for your specific loading of your trailer.
__________________

__________________
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 03-10-2016, 11:50 AM   #31
4 Rivet Member

 
2016 25' Flying Cloud
Holly Springs , Mississippi
Join Date: Sep 2015
Posts: 311
Quote:
Originally Posted by SeaLevel View Post
Good questions, and I am curious to find out. Here is a link to the information you referenced.

http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
I hadn't seen this Goodyear loading chart before. If I'm reading it correctly, you can run the GYM at 40 PSI, or the LT235/75-15 at 50 PSI, and they have almost identical load ratings (1880 v. 1820, respectively). So one take-away is you don't have to run GYM's at 65 PSI and another is that I can install and run the LT's at 45 PSI and still have a margin for my FC25FB (7,300 GVW minus TW of about 1000 lbs. = 6300 lbs.; tire rating of 1660 X 4 = 6640 lbs.).

Did I miss a turn anywhere? The Goodyear chart doesn't talk about derating LT tires; is that already considered in the table?
__________________
Bob

2016 FC 25' FB twin
2013 F-150 Lariat CrewCab 3.5 EB 4X4 3.55 axle
Bob662 is offline   Reply With Quote
Old 03-10-2016, 11:58 AM   #32
Rivet Master
 
crispyboy's Avatar
 
1994 30' Excella
alexandria , Kentucky
Join Date: Aug 2004
Posts: 1,656
Images: 3
Bob,
LT tires do not get derated, only passenger tires get derated.
__________________
Steve, Christy, Anna and Scout (Border Collie deceased 11-30-2016)
1994 Classic 30'11" Excella - rear twin
2009 Dodge 2500, 6 Speed Auto, CTD, Quad Cab, Short Bed
Hensley with adjustable stinger
WBCCI # 3072
crispyboy is offline   Reply With Quote
Old 03-10-2016, 03:54 PM   #33
Rivet Master
 
2005 19' Safari
GLENDALE , AZ
Join Date: Aug 2004
Posts: 2,441
Recent posts on several tire threads indicate that some are considering running GYMs at 40-46 psi. For those who decide to run lower tire pressures this summer, please mark your calendars with a reminder this fall to add your results to the tire failure poll (assuming you have not already participated). -- Thanks!

Link: Airstream Tire Failure Poll
__________________
Phoenix is offline   Reply With Quote
Old 03-11-2016, 08:37 AM   #34
Rivet Master
 
2017 30' Classic
Anna Maria , Florida
Join Date: Apr 2014
Posts: 852
Quote:
Originally Posted by swan View Post
There are so many threads about this stuff... I'm still scratching my head, though. I don't understand why everyone wants to max out their tire inflations.

I have a 28' 2013 International, which is dual axle, with the stock Goodyear ST225/75R15s. I had my trailer weighed at a truck stop when we were loaded up on a 6-month trip. It came in just under 7,000 lbs.

If you divide 7000/4, you come up with each tire being loaded with 1750lbs. If you look at Goodyear's inflation guide for those tires, it recommends 35lbs of pressure for 1760lbs of weight, cold—even thought the tire can take 65lbs of pressure, for a max rating of 2540lbs. Airstream says the trailer's loaded weight is 7500lbs. Divide that by 4, and you get 1875, which would be 40lbs cold. So, I should be running between 35 and 40 lbs cold, if I want to error on the cautious side. Why are people jacking them up to 65lbs?

Is there something I'm missing?
A wise man once said " Over analysis induces Paralysis". My 30, International weighs in at a bit over 7,000 lbs on the trailer axles. And that is with a full tank of water. With no water I am at 6,700 lbs for our normal cruising, the truck rear axle at the recommended GVW. The reason to inflate the GYM pos tires is to keep the sidewalls from flexing. To prevent premature thread separation. What a joke! It will do that regardless.
__________________
franklyfrank is offline   Reply With Quote
Old 03-11-2016, 08:41 AM   #35
Rivet Master
 
2017 30' Classic
Anna Maria , Florida
Join Date: Apr 2014
Posts: 852
Quote:
Originally Posted by CapriRacer View Post
Don't forget that the weight on the tires is NOT evenly distributed. I'm using a 15% variation until I find better data.

Also, don't forget to provide a margin of unused capacity - commonly called "Reserve Capacity". I use 15% there as well!
Reserve capacity is built into the tires. You can run them at the rated loading stamped on the tires 24/7 and they will hold up just fine.
__________________
franklyfrank is offline   Reply With Quote
Old 03-11-2016, 09:09 AM   #36
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
If considering different wheels, make sure they are rated for the the loads to be imposed and check the maximum air pressure. In looking at the SenDel listing below: one sees even two 14" wheels rated 1,900 pounds each at 60 psi exceeds the 3,000 axle rating of a 23D. The recommended sidewall max tire pressure on the 14" tires and the 15" Michelins we installed on the five lug nut wheel (designed for the 10" brake drums) is 50 psi. The six lug 15" wheel is rated 2,830 pounds at 80 psi which covers all the airstreams not withstanding the tire choice issues. The six lug 16" wheel is rated 3,580 pounds at 80 psi.

http://www.sendelwheel.com/wheels/t03bm
__________________
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 03-11-2016, 04:55 PM   #37
Rivet Master
 
m.hony's Avatar
 
2013 30' Classic
Greenwood , Mississippi
Join Date: Oct 2012
Posts: 11,832
At the very least, keeping the same wheels, you could go from Load Range D to Load Range E.
That would be an improvement.
__________________
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
TAC #MS-10
WBCCI #1811, Region 6, Unit 56
Airforums #70955
m.hony is online now   Reply With Quote
Old 03-11-2016, 07:27 PM   #38
Rivet Master
 
1981 31' Excella II
New Market , Alabama
Join Date: Sep 2011
Posts: 5,648
E rated tires at 85 psi on a 8000lb trailer or less is insane and will shake your trailer to death and reduce the contact patch. You only need two out of the 4 tires touching the ground with those. The 235/75-XL15 tires are more than enough for all but the heaviest trailers. I run 50 psi in the above size tire and they run cooler than the E rated tow vehicle tires. The trailer rides comfortably and is not jarred to death by running dump truck tires on the equivalent of a Porsche. Tire pressure is best determined by measuring the temperature of the tire in the center and the sides. When you get all 3 close to each other you are golden.

Bigger rims give you the option of putting disk brakes on older trailers which is not a bad way to go. My old alloy Excella rims don't have room for disk brakes.

Perry
__________________
perryg114 is offline   Reply With Quote
Old 03-11-2016, 08:00 PM   #39
4 Rivet Member
 
2016 23' International
Salem , Oregon
Join Date: Nov 2015
Posts: 295
I started this thread as I did not know what wheels came on my trailer. I just picked it up yesterday. It is a lightly used 2016 Intl serenity.

I hate to waste perfectly good rims. I can live with the cost of the new tires but was hoping there was a better tire and keep the existing rims.

Hope this clarifies what my point was. I purchased for a very good price so the cost of new wheels will not break the bank.

Thanks for all the comments.

Dave
__________________
NoResults is offline   Reply With Quote
Old 03-11-2016, 08:09 PM   #40
Rivet Master
 
m.hony's Avatar
 
2013 30' Classic
Greenwood , Mississippi
Join Date: Oct 2012
Posts: 11,832
There may really be no real way to upgrade unless you get 16" wheels and LT tires.
Sell the current wheels on Airstream Classifieds.


Sent from my iPad using Airstream Forums
__________________
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
TAC #MS-10
WBCCI #1811, Region 6, Unit 56
Airforums #70955
m.hony is online now   Reply With Quote
Old 03-11-2016, 08:09 PM   #41
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
Many of the tire manufacturers are planning on abandoning the 14" tire market. That is one reason why I wanted to more to 15" tires and wheels.
__________________
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 03-11-2016, 08:10 PM   #42
Rivet Master
 
m.hony's Avatar
 
2013 30' Classic
Greenwood , Mississippi
Join Date: Oct 2012
Posts: 11,832
Quote:
Originally Posted by perryg114 View Post
E rated tires at 85 psi on a 8000lb trailer or less is insane and will shake your trailer to death and reduce the contact patch. You only need two out of the 4 tires touching the ground with those. The 235/75-XL15 tires are more than enough for all but the heaviest trailers. I run 50 psi in the above size tire and they run cooler than the E rated tow vehicle tires. The trailer rides comfortably and is not jarred to death by running dump truck tires on the equivalent of a Porsche. Tire pressure is best determined by measuring the temperature of the tire in the center and the sides. When you get all 3 close to each other you are golden.

Bigger rims give you the option of putting disk brakes on older trailers which is not a bad way to go. My old alloy Excella rims don't have room for disk brakes.

Perry

You don't have to run them at 86 psi.
65 psi per the tire placard on the side of the trailer is fine.
50 psi would probably be fine.


Sent from my iPad using Airstream Forums
__________________

__________________
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
TAC #MS-10
WBCCI #1811, Region 6, Unit 56
Airforums #70955
m.hony is online now   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
Upgrade to 16" wheels and tires 1975 Argosy 24 chadloose Wheels, Hubs & Bearings 7 04-24-2013 05:50 AM
Upgrade to 16 inch Wheels and Tires ddruker 1999 Safari 3 03-04-2013 05:18 PM
16'' wheels and tires upgrade on older Airstream woodfox45 Tires 9 03-04-2012 12:16 AM
from Old axles/15" wheels/bias tires to Dexters/16" wheels/LT tires fitzjo1 Axles 8 01-18-2011 07:41 PM
New wheels and tires upgrade to 16" & Michelin Tin Diesel Wheels, Hubs & Bearings 9 04-23-2008 11:48 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:18 AM.


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.