Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A 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 05-24-2014, 06:08 PM   #1
Senior Member
 
akeyzoo's Avatar
 
Join Date: May 2013
Posts: 959
Double check my tire inflation numbers please :-)

Ok, have had tires inflated per the sticker inside, 120psi front and 95psi rear duals.

Finally did a 4 corner weigh.

LF. 5620. RF. 5660
LR. 9920. RR. 9900


Seems I am overinflated. What should my Michelin XZA2 295/80 22.5 inflation be.

https://www.michelinb2b.com/wps/b2bc...s_Brochure.pdf

Just want someone to dbl check me before I recallibrate my tpms and all.

Thanks chris
__________________

__________________
------------------------------------
American Revolution 40L CAT C9
Samsung 197, TireMinder, Ready Brute Elite with Wrangler
akeyzoo 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 05-24-2014, 06:31 PM   #2
Senior Member
 
BFlinn181's Avatar
 
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 16,213
I calculate
80 lbs front
80 lbs rear duals.


The numbers on the sticker are often the maximums, not adjusted for weight.
__________________

__________________

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 is online now   Reply With Quote
Old 05-24-2014, 06:36 PM   #3
Senior Member
 
Steve Ownby's Avatar
 
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,393
Chris,

I would probably go 85-90 all the way around. The numbers on the table is the minimum pressure required to carry that weight. There is no issue with going a little higher pressure while under inflation is dangerous and destructive.


Steve Ownby
Full time since '07
__________________
Steve Ownby
Full time since 2007
2003 Monaco Signature
Steve Ownby is offline   Reply With Quote
Old 05-25-2014, 06:36 AM   #4
Senior Member
 
Join Date: Dec 2013
Location: Lake Havasu City, AZ & Plover, WI
Posts: 1,709
If you run 5 psi over the minimum at a 60* morning temp, you will have an acceptable morning cold starting pressure for almost any temp from 30 up to 80* and most altitude changes. I do that and I can travel from WI to AZ via Colorado and Utah with all the temp and altitude changes and the cold morning start pressures are always above the minimum and below the max.
__________________
Crasher is online now   Reply With Quote
Old 05-25-2014, 06:51 AM   #5
Senior Member
 
ImagineIF's Avatar
 
Join Date: May 2010
Posts: 1,045
I never run my tires at the minimum required and would never run them at Michelin's lowest rated tire pressure. I will sacrifice ride for safety. I run my pressures 10-15 psi over minimum and can't feel the difference in ride.

Use a calibrated pressure gauge and go with 95 psi on the steer and 90 psi on the drive assuming your weights were fully loaded. Your front weight is the max at 80psi, so even another front seat passenger pushes you over 80psi. You might be surprised how far off some gauges can be.

BTW, at your weights I'm surprised you don't have 275s. Have your tires been upgraded. Does the manufacturer's decal show dry weights and loaded weights?
__________________
Gil
99 Country Coach
Prevost XL 45 Conversion
ImagineIF is offline   Reply With Quote
Old 05-25-2014, 05:15 PM   #6
Senior Member
 
akeyzoo's Avatar
 
Join Date: May 2013
Posts: 959
Thanks guys.

Ya, these are original tire sizes. I do have unloaded, loaded and max weight on stickers. Just surprised how much below capacity I am on steer axle, rear axle about maxed out.

I am on a trip and will wait to adjust steer axle pressure until I am home. Last time I tried to adjust a schrader valve stuck open.

Chris
__________________
------------------------------------
American Revolution 40L CAT C9
Samsung 197, TireMinder, Ready Brute Elite with Wrangler
akeyzoo is offline   Reply With Quote
Old 05-25-2014, 05:24 PM   #7
Senior Member
 
SeeTheUSA's Avatar
 
Winnebago Owners Club
Join Date: Apr 2005
Location: Texas
Posts: 1,454
The largely-accepted formula from an experienced tire person on the Tiffin Network forum is to add 5% to the scale weight, then add 5psi to what the chart says. Provides a bit of a safety factor rather than to risk under-inflation.
__________________
Warren and Debbie, Deep in The Heart of Texas, 2018 Winnebago View 24D
2014 Tiffin Breeze 32BR, 2012 Winnebago Navion 24G, 2006 Winnebago View 23H
SeeTheUSA is offline   Reply With Quote
Old 05-25-2014, 07:34 PM   #8
Senior Member
 
Join Date: Nov 2003
Location: Richmond Hill, GA USA
Posts: 671
Quote:
Originally Posted by BFlinn181 View Post
I calculate
80 lbs front
80 lbs rear duals.


The numbers on the sticker are often the maximums, not adjusted for weight.

I agree. If it were my coach, I'd be running 85 front and rear assuming that the weights were full tanks and loaded for travel.

Fred
__________________
Fred & Vicki
St. Augustine, Fl.
Fred Cooper is offline   Reply With Quote
Old 05-25-2014, 07:48 PM   #9
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 13,688
Keep in mind the RMA states over 90% of ALL tire failures are the result of underinflation/overloading. What is a good way to reduce your odds of a tire failure_ never risk running them underinflated/overloaded. The mfgrs recommendation for tire pressure will account for driving a max'd out coach weight.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution. "Abraham Lincoln"
Ray,IN is offline   Reply With Quote
Old 05-26-2014, 07:03 AM   #10
Member
 
Shadow0120's Avatar
 
Join Date: Aug 2012
Posts: 81
I would say 85 all the way around.
__________________
Shadow0120 is offline   Reply With Quote
Old 05-26-2014, 10:13 AM   #11
Senior Member
 
BFlinn181's Avatar
 
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 16,213
I hope all this 'fine tuning' of tire pressure recommendation is taking into account some other important factors. Tires can lose 1-4 psi each month due to air molecules traveling through the rubber of the tire. (Thin walled bicycle tires can lose 5 psi a day!) Tires never GAIN air, only lose it. Also, on a 70 day, a rolling tire can increase pressure due to heat by 10-15 psi. The recommended numbers by tire manufacturers is the minimum psi to safely carry the maximum load. Most (over 75%) tire failure is due to under inflation. Under inflated tires wear faster (on the outside edges) and reduce fuel mileage.
__________________

__________________

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 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
Checking Tire Pressure s1njin Class C Motorhome Discussions 32 06-11-2014 02:30 PM
How do you secure your spare tire & wheel? seb1899 iRV2.com General Discussion 7 05-26-2014 08:43 PM
Spare Tire question and Roadside Assistance n5pht Class C Motorhome Discussions 20 04-05-2014 03:40 PM
TST Tire monitoring perameters THERAPY GUY Newmar Owner's Forum 9 04-02-2014 12:27 PM
2013 Fleetwood Excursion 33A tire inflation pressures Husky Class A Motorhome Discussions 3 03-29-2014 10:38 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 11:13 AM.


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