Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > 5th Wheel Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 05-10-2015, 05:42 PM   #1
Junior Member
 
Join Date: Aug 2012
Posts: 18
Tire pressure question

I have a 40ft Landmark. Tires say 110lbs max pressure. Should I make them up to the max of 110lbs when cold? Right now they are about 98lbs.
TIA
__________________

__________________
dougandrobin is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 05-10-2015, 07:00 PM   #2
Senior Member
 
FastEagle's Avatar
 
Join Date: Sep 2009
Posts: 819
Quote:
Originally Posted by dougandrobin View Post
I have a 40ft Landmark. Tires say 110lbs max pressure. Should I make them up to the max of 110lbs when cold? Right now they are about 98lbs.
TIA
You should inflate them to the pressure recommended in your owner's manual, on the tire placard and certification label.

FastEagle
__________________

FastEagle is offline   Reply With Quote
Old 05-10-2015, 07:06 PM   #3
Member
 
samschudi's Avatar
 
Join Date: Apr 2015
Location: Oak Grove Minnesota
Posts: 88
I think the key here id enough pressure where the face of the tire rides flat to the road surface, with minimal sidewall deflection. 98 lbs may be perfect, depending of how much weight the tire is carrying on your loaded MH. Think of it this way, at 110 lbs pressure, the tire can carry the maximum recommended weight as listed on the sidewall. Not likely it is loaded that heavy, plus the tire pressure will increase as the tire heats up.
__________________
samschudi is offline   Reply With Quote
Old 05-10-2015, 07:19 PM   #4
Senior Member
 
justafordguy's Avatar
 
Join Date: Apr 2015
Posts: 399
What model is the landmark? Also what is the gvw? I always inflate to the max marked on the tire.
__________________
2015 Gateway 3650BH
2005 F250 CC 4x4
justafordguy is offline   Reply With Quote
Old 05-10-2015, 07:43 PM   #5
Senior Member
 
CampingCajun's Avatar
 
Join Date: Jul 2014
Location: Lafayette, La.
Posts: 1,144
You should get axle weights on your 5ver & then check the manufacturers inflation chart & air them up accordingly. That is the best way to get inflation pressures.
__________________
2011 40' Monaco Cayman PBQ ISC 360
2013 Jeep Wrangler Unlimited
CampingCajun is offline   Reply With Quote
Old 05-10-2015, 09:19 PM   #6
Senior Member
 
Join Date: Apr 2004
Posts: 1,079
Using a minimum pressure from a tire chart isn't the best idea for a tire on a trailer for several reasons.
The biggest reason industry experts and tire manufacturers recommend max sidewall pressures is internal ply shear forces.
Tires on a multi close spaced trailer axle system in the center of a heavy box actually slide sideways at the trailer is pulled around the corner (side scrubbing).
Max pressures help hold the tires shape and helps reduce shear forces at work.
Cooler operating and a host of other reasons.

I think Goodyear website says it best;

Goodyear Tire and Rubber .... weighing RVs
Special Considerations

Unless trying to resolve poor ride quality problems with an RV trailer, it is recommended that trailer tires be inflated to the pressure indicated on the sidewall of the tire. Trailer tires experience significant lateral (side-to-side) loads due to vehicle sway from uneven roads or passing vehicles. Using the inflation pressure engraved on the sidewall will provide optimum load carrying capacity and minimize heat build-up
__________________
'03 Dodge 2500 Cummins HO 3.73 NV5600 Jacobs
'98 3500 DRW 454 4x4 4.10 crew cab
'97 Park Avanue RK 28' 2 slides
JIMNLIN is offline   Reply With Quote
Old 05-11-2015, 01:13 AM   #7
Senior Member
 
FastEagle's Avatar
 
Join Date: Sep 2009
Posts: 819
Here is a reference for the proper use of tire load inflation tables.

Tires 101: Tire Load & Inflation Tables | Toyo Tires

FastEagle
FastEagle is offline   Reply With Quote
Old 05-11-2015, 04:45 AM   #8
Junior Member
 
Join Date: Aug 2012
Posts: 18
Thanks all!
__________________
dougandrobin is offline   Reply With Quote
Old 05-11-2015, 12:22 PM   #9
Senior Member
 
FastEagle's Avatar
 
Join Date: Sep 2009
Posts: 819
I took some pictures at a RV show some time ago. I was impressed with the tire fitment on this Landmark. Goodyear G114 17.5" LRH.

Greenville_RV_show_-_1-2015_31_ - iRV2.com RV Photo Gallery

FastEagle
FastEagle is offline   Reply With Quote
Old 05-11-2015, 03:21 PM   #10
Registered User
 
Forest River Owners Club
Join Date: Mar 2010
Location: Western, MA
Posts: 619
Quote:
Originally Posted by CampingCajun View Post
You should get axle weights on your 5ver & then check the manufacturers inflation chart & air them up accordingly. That is the best way to get inflation pressures.

This is what I've been doing. I second guessed myself after reading JIMNLIN's answer so I called Goodyear direct. I have the G614's that I run at 95-100 psi based on the load inflation chart and my 7k axles. Goodyear confirmed that you always go by the load inflation chart and not go with max sidewall listed pressure. I did mention what Jim posted about their RV guide saying that but they told me to go the other way. I guess it's dealer's choice since they post the info both ways...
__________________
taken is offline   Reply With Quote
Old 05-11-2015, 08:35 PM   #11
Senior Member
 
FastEagle's Avatar
 
Join Date: Sep 2009
Posts: 819
Setting the recommended tire inflation pressures for your Original Equipment tires (OE) is the sole responsibility of the vehicle manufacturer. That is written into the DOT tire safety regulations. Tire manufacturers will - in the end - always agree with that. In the reference below Goodyear has done so.

Tire Pressure Basics | Goodyear Auto Service Center

On the other hand, replacement tires that are a different size than the OE tires all have the same rule. They must provide the same load capacity as the OE tires. That is when the load inflation tables are needed the most, to determine the amount of inflation pressure needed in the replacement tires to get the needed load capacity from them.

FastEagle
FastEagle is offline   Reply With Quote
Old 05-11-2015, 08:46 PM   #12
Senior Member
 
Join Date: Apr 2004
Posts: 1,079
Quote:
Originally Posted by taken View Post
This is what I've been doing. I second guessed myself after reading JIMNLIN's answer so I called Goodyear direct. I have the G614's that I run at 95-100 psi based on the load inflation chart and my 7k axles. Goodyear confirmed that you always go by the load inflation chart and not go with max sidewall listed pressure. I did mention what Jim posted about their RV guide saying that but they told me to go the other way. I guess it's dealer's choice since they post the info both ways...
I've mentioned it to the 1-800 folks and they had no idea that it was there on their website nor did they understand about inner ply shear/side scrubbing issues and close spaced axles/tires on trailers. After all their in the business to sell you a tire.
However experienced trailer owners and RV tire blogs recommend max pressures in tires on a conventional trailer with axle in the center. Now a interstate trailer type with tires at the corners don't side scrub so a minimum pressure works for them.

More reading on the subject from the pros;
Step 5 - Tire Loads | RV Tire Inflation Procedures . 5th wheel street at one time did recommend a minimum pressure chart for trailers but woke up and no longer recommend doing so.

and from a actual tire engineer;
RV Tire Safety: Inflation. Scroll down about 2/3rds to the bottom and see his info on interply shear forces on a trailer.

Never heard of derating a tire on a trailer till I started hanging out on RV websites.
__________________
'03 Dodge 2500 Cummins HO 3.73 NV5600 Jacobs
'98 3500 DRW 454 4x4 4.10 crew cab
'97 Park Avanue RK 28' 2 slides
JIMNLIN is offline   Reply With Quote
Old 05-14-2015, 09:32 AM   #13
Junior Member
 
Join Date: May 2015
Posts: 7
Tire air pressure should be what is stated for the weight of your trailer per the charts. There is a red neck way of using the proper air pressure-rub chalk across the tread about an inch wide and pull the trailer a short distance and check the chalk mark. If the chalk mark is worn evenly the air pressure is pretty close.

Happy Camping
__________________
3ares is offline   Reply With Quote
Old 05-14-2015, 10:13 AM   #14
Senior Member
 
glennwest's Avatar
 
Join Date: Mar 2009
Posts: 1,085
Quote:
Originally Posted by 3ares View Post
Tire air pressure should be what is stated for the weight of your trailer per the charts. There is a red neck way of using the proper air pressure-rub chalk across the tread about an inch wide and pull the trailer a short distance and check the chalk mark. If the chalk mark is worn evenly the air pressure is pretty close.

Happy Camping
Only way to accurately do this is weigh each wheel individually. I haven't. Only used cat scales. So I weigh at max per tire rating.
__________________

__________________
2003 Teton Grand Freedom. 2006 Freightliner Century 120 with Detroit 14L and Ultrashift.. Full time going from job to job. Building and maintaining plants across the USA. Sold 2006 Mobile Suites 32TK3
glennwest is offline   Reply With Quote
Reply

Tags
tire pressure



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
Tire pressure built up over time sitting bokobird Class A Motorhome Discussions 16 04-16-2015 10:07 PM
Toad's right front tire pressure and temperature TXBart Entegra Owner's Forum 20 04-11-2015 05:21 PM
Checking Tire Pressure s1njin Class C Motorhome Discussions 32 06-11-2014 02:30 PM
Michelin Tire Pressure questions Rvbuzz MH-General Discussions & Problems 6 05-25-2014 02:52 PM
Recommended Minimum Tire Pressure carolinagirl Winnebago Industries Owner's Forum 43 01-02-2014 08:43 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:52 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.