Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-20-2017, 06:49 PM   #15
Rivet Master
 
switz's Avatar

 
2014 31' Classic
2015 23' International
2013 25' FB International
Apache Junction , Arizona
Join Date: Sep 2012
Posts: 5,347
Images: 8
The 15" Michelin LTX (P) 235/75R15 XL tires are passenger tires with an XL = extra load rating. Thus they must have the sidewall load rating derated by 10% for trailer use. Thus the 2,183 pounds side wall rating @ 50 psi must be derated to 1,985 pounds for trailer use. The issue is that there are no truck 15" "LT" tires available from major brands in the USA.

That 15" Michelin tire has enough capacity for any model 25 or 26 and can be used even on the 27/28 models. I carried 44 psi on the 2013 25FB International Serenity Michelins and now in the 2015 23D International Serenity with the same model tire. Here are the actual scale numbers for our 23D

Camping Ready 23D my scales 9 May 2016 Full water and propane tanks

Tongue………928
Front….1,280……1,246 - total front axle 2,526
Rear…..1,376……1,233 - total rear axle 2,609
Total Axles………5,135
Total Trailer….6,063

There is more safety margin with the 15" Michelins on our 23D than the 15" GYM tires rated 2,540 pounds installed on our 2014 Classic. That is why we immediately installed the 16" SenDel T03-66655T wheels and 16" Michelin LT225/75R16/E LTX M/S2 tires rated 2,680 pounds @ 80 psi. Plus those are the same tires and wheels installed by Airstream on model 25 trailers and larger as an extra expense option.
__________________

__________________
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 07-20-2017, 07:51 PM   #16
Rivet Master

 
2007 22' International CCD
Corona , California
Join Date: Jul 2013
Posts: 6,766
WD Hitch adjustment needed for switching from 15" to 16" tires?

What pressure do you run those tires...80psi or some lesser number? I have a 23FB International.
__________________

__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
rmkrum is offline   Reply With Quote
Old 07-20-2017, 08:28 PM   #17
Rivet Master
 
switz's Avatar

 
2014 31' Classic
2015 23' International
2013 25' FB International
Apache Junction , Arizona
Join Date: Sep 2012
Posts: 5,347
Images: 8
We run 44 psi in the 15" Michelin LTX (P) 235/75R15 XL tires installed on the 23D International Serenity. That is the pressure recommended by Andy Thompson at CanAm in London, Ontario, Canada and the same pressure we used on the 2013 25FB with that same model tire that was about 900 pounds heavier at a loaded weight of 6,900 pounds.

We run 73 psi in the 16" Michelin LT225/75R16/E LTX M/S2 tires installed on our 2014 31' Classic. That is the pressure that worked out based upon the individual wheel weights of the Classic and using the load chart for that tire. To be anal, 72.5 psi would be the intermediate pressure to use...
__________________
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 07-21-2017, 07:43 AM   #18
1 Rivet Member
 
2015 25' FB International
Midlothian , Texas
Join Date: Jul 2017
Posts: 6
Switz

Based on your experience - would you recommend upgrading the Goodyear 15 with top of the line cooper or Michelin 15's or upsizing all together to the 16"LT?
Slow roll is offline   Reply With Quote
Old 07-22-2017, 01:41 PM   #19
Rivet Master
 
switz's Avatar

 
2014 31' Classic
2015 23' International
2013 25' FB International
Apache Junction , Arizona
Join Date: Sep 2012
Posts: 5,347
Images: 8
The 16" tires and wheels will fit on any 25' or longer Airstream trailer. The stock 15" GYM ST225/75R15D tires rated 2,540 pounds @ 65 psi were 28.3" in diameter on our 2014 31' Classic. When upgraded to the 16" SenDel T0-66655T wheels and Michelin LT225/75R16/E LTX M/S2 tires rated 2,680 pounds @ 80 psi with a diameter of 29.2", the trailer was raised about 0.45".

Our Classic's scale numbers are:

Classic Scale numbers May 2014

……1200……——1200

2034……2042—4076

1921…….2062—3983

Total weight——9259

The lighter left rear reflects the removal of the six gallon water storage in the original water heater which was replaced with a propane only instant on water heater. The tire load table for this tire is:

80psi 2,680 (E)
75psi 2,560
70psi 2,440
65psi 2,335 (D)
60psi 2,190
55psi 2,060
50psi 1,940 (C)
45psi 1,790

We could run 72.5 psi but round up to 73 psi on the 16" Michelins.
__________________
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 07-22-2017, 02:28 PM   #20
Rivet Master
 
HowieE's Avatar
 
1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 7,008
Images: 12
Please denote your axles weights by axle. Not sure how you are running less weight on what looks like the rear TV axle in the last line of weights.

If your trailer is in fact just over 3900 lbs 60 psi would work
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

HowieE is offline   Reply With Quote
Old 07-22-2017, 02:31 PM   #21
Rivet Master
 
Mollysdad's Avatar
 
2017 26' Flying Cloud
Tampa , Florida
Join Date: Feb 2017
Posts: 3,430
Numbers aside, a larger tire doesn't have to turn as often to cover a mile. That translates to reduced wear and heat buildup, as well a bearing longevity.
__________________

Mollysdad 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
New 16" Tires & WD re-adjustment help plz? FishinHatteras Hitches, Couplers & Balls 7 04-16-2015 11:48 AM
Switching Argosy 20' MH to 16" rims? ViewRVs Argosy Motorhomes 4 02-17-2015 05:30 PM
HELP! with tires, switching to 16" rims. Libo Tires 92 01-12-2014 12:19 PM
Changing TVs and switching wd hitch arms to new TV WyoRacerX Hitches, Couplers & Balls 3 06-16-2008 07:34 AM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:36 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.