RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class C Motorhome Discussions
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 10-10-2020, 04:31 PM   #1
Member
 
Join Date: Jun 2011
Location: Kingman,az
Posts: 43
I looked, didn't see ..... tire pressures

2008 class C , ford chassis ,
225-75-16 tires.
dealer said 80 all around,
others have said 65 front-75 rear,

what REALLY should I be running COLD tire pressure.

tires are to new to see any wear patterns, (to high, to low, etc)
typical ford wander, but not bad.

thanks
__________________
Still plays with cars!
cruzn57 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 10-10-2020, 05:21 PM   #2
Senior Member
 
Rocky Larson's Avatar
 
Workhorse Chassis Owner
Join Date: Aug 2007
Posts: 801
I would like to know the DOT date on the side wall to see how new...is too new.

Before you look up the cold tire pressure on the tire charts you will need to 4 corner weigh the coach. I'll bet 80 all around is not likely to come out on top.
__________________
Jan and Rocky
Volunteers USFWS. 8000 hrs each, 25 refuges. 04 Allegro 30DA, WH 8.1, Banks, 2012 Jeep Liberty , Brake Buddy Adv Select, 300watts Solar, "Philippians 4:11-13 KJV"
Rocky Larson is offline   Reply With Quote
Old 10-10-2020, 05:23 PM   #3
Senior Member
 
Taffeys's Avatar
 
Join Date: Feb 2018
Location: Oceanside, California
Posts: 119
You need to weigh it!

https://www.thefitrv.com/rv-tips/how...re-in-your-rv/
__________________
Charles
2007 Lazy Daze 23 1/2' Twin King (2007 Ford E450 SuperDuty Chassis)
Taffeys is offline   Reply With Quote
Old 10-10-2020, 08:01 PM   #4
Senior Member
 
Join Date: Jun 2016
Location: South of Atlanta, Georgia
Posts: 1,139
Hard to find scales to do four corner weights. Weights front and rear will suffice, divide the axle weight in half and then add a little, you will be close, with the tire charts.

RV manufacturer should have put tire pressures on the sticker many times found inside the wardrobe door. Or on the drivers door jam area. Upfitter is responsible for doing this.

Charles
__________________
'03 Ram 2500 CTD, 5.9HO six speed std cab long bed Leer top and 2008 Bigfoot 25B21RB.. Previous, Being repaired and will be sold, is a 2008 Thor/Dutchman Freedom Spirit 180. SOLD - 2007 Winnebago View 23H Motorhome.
CharlesinGA is offline   Reply With Quote
Old 10-10-2020, 10:50 PM   #5
Member
 
Join Date: Jun 2011
Location: Kingman,az
Posts: 43
ok thx

I have a hard time believing more than 5 or 10 % of all RV owners ever weight their R V, I doubt I will ever,
that said, why do so many over think something so simple.

"year of my tires" 6 mos old, and when I bought them, I had them list the manf date on the sales slip. ( all 6 were less than 6 mos old -from date
of manufacture)
what has that got to do with air pressure? .....seriously,

while I do appreciate the info I get from here, (on other subjects)
some of the reply's indicate many of you are bored, LOL
__________________
Still plays with cars!
cruzn57 is offline   Reply With Quote
Old 10-10-2020, 11:02 PM   #6
Senior Member
 
Join Date: Jun 2016
Location: South of Atlanta, Georgia
Posts: 1,139
Typical Ford wander. Well, that is easily cured with a PROPER front end alignment. The CASTER is something like 1.5 degrees from the factory. If you get aftermarket eccentrics you can change that to about 4.5 to 5 degrees Caster and that will cure the wander and white knuckle you get driving it. Ford does not set the chassis up for weights as high as most motorhomes go, they set them up for lightly loaded in town delivery trucks. There is not enough caster and the front end wanders. Add caster and you add stability in tracking. A GOOD alignment shop will know this. Eccentrics are made by Moog and others.

Charles
__________________
'03 Ram 2500 CTD, 5.9HO six speed std cab long bed Leer top and 2008 Bigfoot 25B21RB.. Previous, Being repaired and will be sold, is a 2008 Thor/Dutchman Freedom Spirit 180. SOLD - 2007 Winnebago View 23H Motorhome.
CharlesinGA is offline   Reply With Quote
Old 10-17-2020, 07:50 PM   #7
Junior Member
 
Fleetwood Owners Club
Join Date: Oct 2020
Posts: 6
Weight is relevant to tire pressure. That said, most Ford chassis Class-C's are at or near the load rating of the tire, front and rear so unless you have a very small/light rig, I'd recommend going with 80psi front and rear and Michelin LTX/Defender tires. I have found that Michelin over-engineers their tires while other brands don't stand up long to max load/pressure.

Quote:
Originally Posted by cruzn57 View Post
I have a hard time believing more than 5 or 10 % of all RV owners ever weight their R V, I doubt I will ever,
that said, why do so many over think something so simple.

"year of my tires" 6 mos old, and when I bought them, I had them list the manf date on the sales slip. ( all 6 were less than 6 mos old -from date
of manufacture)
what has that got to do with air pressure? .....seriously,

while I do appreciate the info I get from here, (on other subjects)
some of the reply's indicate many of you are bored, LOL
Uniblab is offline   Reply With Quote
Old 10-18-2020, 02:31 AM   #8
Senior Member
 
Join Date: Jul 2014
Posts: 24,294
I had a 2000 class C and the door sticker PSI was 65 front and 80 rear. That's what I used.

The front axle was rated for the same weight as 65 PSI in the tire could carry.
Unless overloaded, it didn't need any more pressure.

I now have a Class A on a E450 chassis. Same size tires as the C.
Label behind drivers seat says 75 front, 80 rear, and thats what I use.
twinboat is online now   Reply With Quote
Old 10-18-2020, 04:15 AM   #9
Senior Member
 
Podivin's Avatar
 
Winnebago Owners Club
Join Date: Dec 2015
Location: Jacksonville, Fl
Posts: 2,934
Nobody here can tell you exactly what pressure to run in your tires, all you'll get is 'what worked for me' type answers, which may or may not be right for YOUR RV.

Your only real viable choices are to weigh the RV and run the appropriate pressure for the weight, or to simply use what the RV manufacturer said to use on the sticker that shows exactly what pressure to use. Since you've stated you won't be weighing your RV, read the sticker - do what it says.
__________________
2013 Winnebago Sightseer 36V
Podivin is online now   Reply With Quote
Old 10-18-2020, 05:43 AM   #10
Senior Member
 
richard5933's Avatar
 
Join Date: May 2019
Posts: 1,673
Quote:
Originally Posted by cruzn57 View Post
I have a hard time believing more than 5 or 10 % of all RV owners ever weight their R V, I doubt I will ever,
that said, why do so many over think something so simple...
Not sure why you say this. It takes less than 5 minutes to pull over the scales and get weighed, and costs only $12.

You'd rather guess at the proper pressure for your tires?
__________________
Richard
1974 GMC 4108 - Custom Coach Conversion
richard5933 is online now   Reply With Quote
Old 10-18-2020, 06:11 AM   #11
Senior Member
 
Join Date: Jul 2014
Posts: 24,294
Quote:
Originally Posted by richard5933 View Post
Not sure why you say this. It takes less than 5 minutes to pull over the scales and get weighed, and costs only $12.

You'd rather guess at the proper pressure for your tires?
I don't guess, I use the expertise of the RV and tire manufactures.
twinboat is online now   Reply With Quote
Old 10-18-2020, 06:43 AM   #12
Senior Member
 
Winnebago Owners Club
Join Date: Aug 2019
Location: Meshoppen, PA
Posts: 784
Quote:
Originally Posted by Taffeys View Post
This is reasonable methods

1. know what your RV label says for tires.
2. know what your specific tires are rated at by the tire label. (some are 80psi or 90psi etc. )
Now compare the data you have and you will the direction you need to be in..

3. Again go to Label for you Axle weights.. forget total GVWR for now , look at each end ...
4. stop at a truck stop as I am sure 90% of all you RV Class C Owners are near one. GET the weight..

Remember to have RV loaded for travel on your average trip,, fuel, water, people, etc etc.. THIS IS HUGE .

Now look at the MAX tire ratings on your tire. use this as a guide , compare the weights of axles, remember the rating of weight / psi varies per single tire vs duals.. do some math or educated guess on your load compared to tires and also the RV Label.

You may see 3 very different sets of weights,, Tires will generally be a bit past the vehicle spec when at max PSI.
this is why most say never do max pressure but get your data and see where you need to be.

In my experience with the E350 chassis and a 12400 GVWR.. my tires are 90 PSI max ratings. my Label says 65 frt 70 rear BUT the Tires listed by OEM are 80psi max tires ..
I did a few trips this year, I know my weights and my loading of RV has "weight" on frt Axle I am within 100-140lbs of max. 65 psi is "mush".
I have gone 70-73 cold.. Rears I had at 82-84 cold and worked well with a trailer on.. (400 tonque), With out trailer i felt every crack in road and droped to 80 psi.. my rear axle is max or tad over with trailer-- depends +/- 150 lbs..
YES I run Class C on the GVWR. GCWR... edge but that is the nature of the beast...

Again tire specific and just how it handles.. BUT The Class C will need rear tires at the max end of the specs regardless...
sibe 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
I didn't see the arrows! MSHappyCampers RV'ing Humor & Crazy but True Stories 5 07-16-2020 06:38 PM
Wow! I didnít see it coming zzotte Newmar Owner's Forum 33 02-23-2019 03:43 PM
Air Conditioning - sealing inside seams - anyone looked to see if it is needed? dexters Travel Trailer Discussion 7 07-21-2016 05:38 PM
Tire pressures for Canyon Star 3920? Tire Minder question!!! Iggyval Newmar Owner's Forum 2 10-25-2015 06:52 PM
We've looked and looked C&C R Winnebago Industries Owner's Forum 11 12-01-2007 12:28 PM


All times are GMT -6. The time now is 08:00 AM.


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