RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Newmar Owner's Forum
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 10-13-2014, 05:18 PM   #1
Junior Member
 
Join Date: Sep 2011
Location: Redvers, Saskatchewan
Posts: 2
Tire Pressure

We have heard so many suggestions on tire pressure to run on our new rig, I thought I would ask your opinion. We have a 4369 Newmar Dutch Star with 315, 80R 22,5 tires. The manufacturer recommends 135lbs. We think this is high. What do you think?
__________________

__________________
The world is not full of strangers, just friends we have not met.
JayBee49 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 10-13-2014, 05:25 PM   #2
RVM#87 / Senior Member
 
DieselTech39's Avatar


 
Solo Rvers Club
Join Date: Jul 2014
Location: Ham Lake, MN
Posts: 3,038
A belated

Glad you're aboard. IMO Most will tell you to get the four corner weight of the coach and adjust your tire pressure using the inflation table for your brand and size of tire for the weight. Enjoy your adventures and be safe.
__________________

__________________
Have a wonderful day!
Ken (RVM 87)
FT DP Wanna B The journey is the destination!
Retired & perfecting procrastination!
DieselTech39 is offline   Reply With Quote
Old 10-13-2014, 05:27 PM   #3
Senior Member
 
wildtoad's Avatar
 
Join Date: Jul 2010
Posts: 4,477
1) There are many threads on this forum about tire pressure, and 2) you will get a lot of responses.

In general the majority of responses will state to get your new to you coach weighed then use the tire manufacturers chart to determine the correct tire pressure.

Most RV manufacturers will have a piece of paper mounted in the coach stating their tire pressure recommendations which is based on their gross vehicle or gross axle weight ratings which will be fine, until you can get it weighed. Me I just go with theirs.

Welcome aboard!
__________________
Tom Wilds
Blythewood SC
2016 Newmar Bay Star Sport 3004
2015 Jeep Wrangler 2DR 4WD Sahara, Automatic, Hard Top
wildtoad is offline   Reply With Quote
Old 10-13-2014, 05:44 PM   #4
Senior Member
 
GaryKD's Avatar
 
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 13,595
Hi JayBee49,
It is really high. Do you have the Newmar recommendation (135 PSI) in writing? Look at it this way if you are at GAWR for each of your axles the Michelin PSI recommendation is:
Drive axle is 20K lbs GAWR. This means 85 PSI
Tag is 10K lbs GAWR. This means 85 PSI
Steer is 17K lbs GAWR. This means 125 PSI

I doubt you are at GAWR. It is possible, but I doubt it. Consider having the coach four corner weighed after you load it for travel. Newmar should have done this and the weight should be on one of the stickers inside one of the cupboard doors. That weight is with a full fuel tank but nothing else. Anything you add (like fresh water, propane, your stuff and people must be taken into consideration).

The minimum PSI Michelin recommends for your tires regardless of weight is 85 PSI. On the sidewall of the tire, there should be a maximum PSI stamped on the tire. For your tires this is:
9090 lbs = 130 PSI for single
8270 lbs = 130 PSI for dual
This is the weight on each tire.

Go to the Michelin RV tire chart at Michelin North America RV Load & Inflation Tables and download the inflation table.
__________________
Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
GaryKD is offline   Reply With Quote
Old 10-13-2014, 10:50 PM   #5
Community Moderator
 
"007"'s Avatar


 
Nor'easters Club
Workhorse Chassis Owner
iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,196
I agree with Gary and table he provided, in fact the Owners Guide has a good write up on your tire pressures.
When they ship new coach's they fill to sidewall pressures which will have to be changed after you have your coach weight and will give you a better ride.
Congratulations on new coach and welcome to the Newmar family and irv2.
In my signature below are links to many others for info for your coach.
Safe travels.
__________________
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans
VISIT the NEWMAR QUICK TIPS & EASYMODS 1 & 2
QUICK TIPS # 3
RV SYSTEMS & APPLIANCES & RECALLS --- TECH INFORMATION
"007" is offline   Reply With Quote
Old 10-14-2014, 01:50 AM   #6
Senior Member
 
jadatis's Avatar
 
Join Date: Oct 2012
Posts: 386
Made a pressure/loadcapacity list for the 315/80R22.6 with my made formula wich is saver even then the formula used by Michellin , wich is in its turn better then the most American lists.
Here a picture of it.

https://lppdmw.dm2301.livefilestore....20IRVforum.PNG
Can not get the picture working so atached it , also not ideal.
then you have to know , as long as you did not weigh, the GAWR's , number of axles and number of tires on each axle.
this is minimum needed , but next is also handy .
From tires the maximum allowed speed given in a letter From J to Q ( probably M or N) . From RV GVWR .
If you give all that , I will fill it in my Motorhome or Travel-trailer tire pressure calculator.

Greatings from a Dutch self declared tirepressure specialist
Peter
Attached Thumbnails
Click image for larger version

Name:	31580R22.5 IRVforum.PNG
Views:	71
Size:	5.4 KB
ID:	76494  
__________________

jadatis 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
What are you guys running for tire air pressure 89sandman Workhorse and Chevrolet Chassis Motorhome Forum 16 06-10-2014 08:59 AM
Checking Tire Pressure narampa Class A Motorhome Discussions 17 06-10-2014 06:43 AM
Fifth wheel tire pressure recommendations Rvmagoo 5th Wheel Discussion 30 04-09-2014 10:04 AM
Best Tire Pressure? mgjessop iRV2.com General Discussion 16 03-11-2014 05:56 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 05:53 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×