Go Back   iRV2 Forums > iRV2.com COMMUNITY FORUMS > iRV2.com General 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 12-29-2013, 11:04 AM   #29
Senior Member
 
New Hobby's Avatar
 
Join Date: Mar 2013
Posts: 201
My tire says max tire pressure is 115. I just checked the pressures and they are at 80psi now. This means that I have driven it for 300 miles at 80psi. I have a trip in 2 weeks to the same location as my last trip a week ago. I will inflate to 115 and see if I can tell a difference. I use to race quads and could feel a difference of 2lbs over same terrain so im sure I will feel a 35lb difference. I will report back here to state my findings. Thanks for the help and concerns
This trip is 65 miles one way.
__________________

__________________
1st new coach "2014 Thor Hurricane 34j"

Shawn, Tori, Ryan and "Paw's Memory"
New Hobby 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 12-29-2013, 11:43 AM   #30
Senior Member
 
palehorse89's Avatar


 
Newmar Owners Club
Join Date: Oct 2009
Posts: 7,731
Time on their side......

Quote:
Originally Posted by New Hobby View Post
I have a friend that owns a very large chain of tire and repair centers. I called him and asked him where I could find a 4 corner scale to weigh my coach and he asked why. I told him so I could set a proper psi in my tires. He asked me about my tires, size, brand, ply and so on. He then told me that I have the best tire made for my coach and to run the max tire pressure and leave it. He said that tires run cooler at max pressure and my tire will handle it.
Im not saying he is right but I do trust him very much, so I will be running 115psi until something gives me a reason to change.

Thanks again for all this great info.
Quote:
Originally Posted by New Hobby View Post
My tire says max tire pressure is 115. I just checked the pressures and they are at 80psi now. This means that I have driven it for 300 miles at 80psi. I have a trip in 2 weeks to the same location as my last trip a week ago. I will inflate to 115 and see if I can tell a difference. I use to race quads and could feel a difference of 2lbs over same terrain so im sure I will feel a 35lb difference. I will report back here to state my findings. Thanks for the help and concerns
This trip is 65 miles one way.
You might find it handles better but might ride a little worse. Like your friend in the tire business, he adjusts the tire pressure to the mfg. max tire pressure(minimum pressure to support max load) Mine was weighed and pressure set, wondered all over, handled terrible. After chasing tire pressure for some time I just went to max tire pressure(rim pressure also) and my problems went away as far as wandering and handling. Rides a bit worse than it did, but I can relax and drive it without fighting the wheel all the time. I could not run the chart pressure determined by my weight and drive good. Big trucks run max pressure all the time and do not adjust pressure for the load they are carrying, Our stores would be empty if truckers used the scales at truck stops for this purpose like RV'ers do. Big trucks use them to adjust their axle weights and to check for being over weight, RVer's use them to adjust tire pressure. Like always, what works for one might not work for another......
__________________

__________________
2000 Newmar MADP 4060, 350ISC, Spartan MM, IFS 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006Ultra & 1989 Springer
palehorse89 is online now   Reply With Quote
Old 12-29-2013, 03:30 PM   #31
Senior Member


 
Join Date: Aug 2011
Posts: 3,282
Quote:
Originally Posted by New Hobby View Post
My tire says max tire pressure is 115. I just checked the pressures and they are at 80psi now. This means that I have driven it for 300 miles at 80psi. I have a trip in 2 weeks to the same location as my last trip a week ago. I will inflate to 115 and see if I can tell a difference. I use to race quads and could feel a difference of 2lbs over same terrain so im sure I will feel a 35lb difference. I will report back here to state my findings. Thanks for the help and concerns This trip is 65 miles one way.
Here is some relevant info on tire pressures from freightliner custom chassis folks.
Attached Thumbnails
Click image for larger version

Name:	image-1699411310.jpg
Views:	52
Size:	282.2 KB
ID:	52822   Click image for larger version

Name:	image-908403699.jpg
Views:	61
Size:	323.9 KB
ID:	52823  

Click image for larger version

Name:	image-4231125394.jpg
Views:	46
Size:	364.8 KB
ID:	52824  
__________________
pasdad1 is offline   Reply With Quote
Old 12-30-2013, 03:40 AM   #32
Senior Member
 
New Hobby's Avatar
 
Join Date: Mar 2013
Posts: 201
Pasdad, my pc wont open those pics. What would I search for to find that info?
__________________
1st new coach "2014 Thor Hurricane 34j"

Shawn, Tori, Ryan and "Paw's Memory"
New Hobby is offline   Reply With Quote
Old 12-30-2013, 06:00 AM   #33
Senior Member


 
Join Date: Aug 2011
Posts: 3,282
Quote:
Originally Posted by New Hobby View Post
Pasdad, my pc wont open those pics. What would I search for to find that info?

The info is also contained in this PDF (somewhere in the middle)

http://freightlinerchassis.com/docum...4504000000.pdf
__________________
pasdad1 is offline   Reply With Quote
Old 01-13-2014, 11:37 AM   #34
Senior Member
 
jauguston's Avatar
 
Join Date: Jul 2006
Location: Bellingham,WA
Posts: 973
Neither of the gauges from Amazon pictured in this thread would work on my outside dual tire. It has a short straight stem and the hub prevents getting the gauge fitting on the stem straight. It takes a near 90 degree fitting to get on the stem straight.
__________________
2005 Sportscoach Elite 40' C-7 350 Cat w/MP-8
Suzuki Samurai toad w/VW 1.6 turbo diesel
800w solar system
jauguston is offline   Reply With Quote
Old 01-13-2014, 12:14 PM   #35
Senior Member
 
focker's Avatar
 
Damon Owners Club
Workhorse Chassis Owner
Join Date: Sep 2012
Location: Sacramento, CA
Posts: 1,267
I have never found a dually set that my Milton gauge I listed here couldn't check but it sounds like you should either change your stems to something different or I might suggest checking the Milton website for other options.

https://miltonindustries.com
__________________
Some of the most asinine things people do are typically preceded by the two words "Watch this".
Scott and Jess |What are the Fockers up to?
focker is offline   Reply With Quote
Old 01-13-2014, 12:49 PM   #36
Senior Member
 
jauguston's Avatar
 
Join Date: Jul 2006
Location: Bellingham,WA
Posts: 973
I have a small digital Accutire gauge that fits them just fine.
__________________
2005 Sportscoach Elite 40' C-7 350 Cat w/MP-8
Suzuki Samurai toad w/VW 1.6 turbo diesel
800w solar system
jauguston is offline   Reply With Quote
Old 01-13-2014, 01:00 PM   #37
Senior Member
 
Mr_D's Avatar
 
Solo Rvers Club
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 28,452
NAPA sells a certified gauge that I use to test my others against. Cost was about $35.

And the pressure molded into the sidewall of a truck size tire is not the maximum the tire should ever have, it is the minimum pressure to support the maximum rating of the tire. This is given in the various tire companies RV guides and an article in Motorhome magazine.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 CR-V
Mr_D is offline   Reply With Quote
Old 01-13-2014, 01:24 PM   #38
"Formerly Diplomat Don"
 
Dutch Star Don's Avatar
 
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 9,283
Okay.....this post has gone from climbing on your roof with a hose and a bucket of water to create the perfect water gauge to just filling your tires to max and not worrying about it . For the older guys, (me included) stay off the roof with the bucket of water or there's going to be a rise in hip replacements.

I think any tire that takes from 80-115 psi isn't going to be detrimentally affected by a 1-3 psi error rate in a tire gauge. How about just using the same gauge for the coach all the time. Mine stays in the coach and is the only one I use.

Finding a location to do a four corner weight check can be difficult, but a front to back weight is pretty simple. I think anyone who cares about how their coach drives, and handles should at least start with the coach manufacturer's suggested psi setting and then go to the tire manufacturer's weight tables and get a good starting point for your coach.

Keep in mind that a lot of us on this forum are getting up in years and gauges that are hard to manipulate, read or don't momentarily store the pressure are harder to use.
__________________
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab
Dutch Star Don is offline   Reply With Quote
Old 01-13-2014, 04:27 PM   #39
Senior Member
 
jauguston's Avatar
 
Join Date: Jul 2006
Location: Bellingham,WA
Posts: 973
Virtually every vehicle built will have a tire pressure chart. My Motorhome has one my Samurai has one and our two Chrysler cars have one. They are there for a reason. The tires have a maximum pressure number molded into the sidewall. Those numbers are NOT for the same thing. The number on the vehicle is what the vehicle engineers have determined are correct for the tire size on the chart to make it handle right. That number has nothing to do with the number on the tire sidewall. The number on the sidewall is the MAXIMUM SAFE PRESSURE that tire can be inflated to regardless of what vehicle it is on. That pressure is almost never the right pressure for any vehicle. Engineers seldom outfit a vehicle with tires that have to be run at their maximum safe pressure. That leaves too little safety margin and their lawyers don't like that (-:
__________________
2005 Sportscoach Elite 40' C-7 350 Cat w/MP-8
Suzuki Samurai toad w/VW 1.6 turbo diesel
800w solar system
jauguston is offline   Reply With Quote
Old 01-13-2014, 08:45 PM   #40
Junior Member
 
Huey428's Avatar
 
Join Date: Aug 2012
Posts: 9
Have this one from Harbor Freight item #90610. Had it tested by Michelin at WIT Rally and it was right on.
Attached Thumbnails
Click image for larger version

Name:	image-1090160029.jpg
Views:	31
Size:	124.8 KB
ID:	53808  
__________________
Huey428 is offline   Reply With Quote
Old 01-13-2014, 10:32 PM   #41
Senior Member
 
VanDiemen23's Avatar
 
Join Date: Oct 2010
Posts: 778
Longacre makes very nice analog gauges. For the average guy on this site though skip the liquid filled. You have to "burp" them after large temperature changes or after driving over mountains.

I spent three races trying to figure out why I was chasing tire pressures and handling all weekend - and then at the next race saw the needle sitting off the peg. Raised the rubber plug on the back to burp the gauge and it zeroed.

I pulled the plug out, drained the mineral oil, and never had another issue!
__________________
VanDiemen23 is offline   Reply With Quote
Old 01-14-2014, 11:04 AM   #42
Senior Member
Commercial Member
 
Join Date: Mar 2010
Location: Akron, Ohio
Posts: 1,471
I have a post on gauge accuracy and how I confirm my gauges are accurate. I do not work for a gauge company or sell gauges, but I am a tire engineer.
__________________

__________________
Retired Design & Quality Tire Eng. Read my tire blog RVTireSafety.NET to learn more about RV tires, valves & wheels. Read THIS post on why Tires Fail
Tireman9 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


» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:51 AM.


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