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05-30-2019, 07:05 AM
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#1
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Senior Member
Monaco Owners Club
Join Date: Jul 2018
Location: Elizabethtown, Ontario
Posts: 224
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Tire air pressure
I have read through the manual and searched this site and I can't find a basic standard air pressure for the tires on my MH.
It is a 2002 40 foot Diplomat with dual rear wheels, no tag, and what I would consider average inside weight.
There will only be me and the General and probably enough clothes to last a couple of weeks.
Food would be fairly limited as we tow a car and will get our groceries every few days so they are as fresh as possible.
A chart in the manual has the total weight of the MH at 30,940lbs
Divided as follows - front 11,100lbs and the rear 19,840.
I think this chart is for an empty MH.
Now based on this info, what would you guys suggest tire pressure should be?
__________________
40 foot 2002 Monaco Diplomat
2005 Ford Focus to tow around
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05-30-2019, 08:45 AM
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#2
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Senior Member
Join Date: May 2013
Location: Ontario, California
Posts: 2,429
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Lets start with "There's no Average tire pressure"
The first thing you need to do is to weight the coach fully loaded. All you have to do is to Google "Truck scales near me" and it will give you a list of vendors.
The best way to weigh the coach is all 4 corners but, most just weight the front then the whole coach and subtract the front from the total for the rear axle weight.
Once you have this info. Google the Tire manufacturer of your current tires and find their weight chart. That will give the tire pressure recommended for the load you're carrying. Anything else is a guess and can cause serious problems if you under-inflate
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[SIGPIC][/SIGPIC]2016 Newmar Dutch Star 4369
Newmar Owners Club
USAF 1966-1969,- Law Enforcement 1969 - 2003, Retired since March 2003
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05-30-2019, 08:55 AM
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#3
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Senior Member
Join Date: Mar 2019
Location: Lansing MI
Posts: 2,825
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X100. You will hear lots of other things, ignore it all, the only proper way to set air pressure is by weight. Anything else is asking for trouble. As a guy told me the other day we deal in facts not forums.
Now having said that, there is the issue of only having axle weights and not wheel weights. In that case do the math but that's pretty easy Front Axle Weight/2; Rear Axle Weight/4 to get weight on each tire. That's assuming you have 4 tires on the rear of the coach.
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05-30-2019, 09:19 AM
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#4
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Senior Member
Join Date: Jul 2010
Posts: 5,332
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You can of course keep things simple, and use the pressure stated on the federally mandated, manufacturer produced placard in your motorhome. No weighing required. If for some reason you don’t like the ride and believe lowering the tire pressure will help, then by all means go get it weighed and adjust accordingly.
One has to wonder why my Goodyear tires state on the tire to use the placard weights.
__________________
Tom
2016 Newmar Bay Star Sport 3004
2021 Jeep Gladiator Sport Willys
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05-30-2019, 09:21 AM
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#5
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Senior Member
Monaco Owners Club
Join Date: May 2012
Location: DFW, Tex-US
Posts: 6,196
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__________________
'11 Monaco Diplomat 43DFT RR10R pushed by a '14 Jeep Wrangler JKU. History.. 5'ers: 13 Redwood 38gk(junk!), 11 MVP Destiny, Open Range TT, Winn LeSharo, C's, popups, vans, tents...
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05-30-2019, 05:21 PM
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#6
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Senior Member
Monaco Owners Club
Join Date: Aug 2009
Posts: 465
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I have the 2002 Diplomat also. Weighing each tire location is a good idea. If you tires are 275-70x22.5, load range "H", you should use more than 110 and less than the stated Max tire pressure of 125.(which should be stated on your tires sidewall). The amount of pressure will help with your ride. And of course too much pressure will cause a hard ride. As stated above by one of the posts, there should be a pressure sheet giving you an idea of what the minimum pressure should be for the weight on a certain size tire. Since we have 8 air bags, I generally run around 112 to 115. In addition, if for some reason you were to have more weight, etc, you would need to take that into consideration during that trip. FWIW.
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2002 Monaco Diplomat Triple Slide PST
2011 Buick Enclave(AWD);
1970 Home built 11.5 ft Slide-in Cabover
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05-30-2019, 05:43 PM
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#7
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Senior Member
Join Date: Oct 2017
Location: Elk Grove CA
Posts: 1,618
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Remember, the pressures in the tables are the minimum pressures for a given weight. Tireman9, an IRV2 member is a retired tire engineer and he recommends inflating to 10% more than the table psi.
You might want to look for and read the many postings by Tireman9 for more information.
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BobC
2002 Itasca Suncruiser 35U
Workhorse Chassis
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06-01-2019, 08:12 AM
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#8
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Senior Member
Join Date: Apr 2011
Location: Florida
Posts: 342
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Also keep in mind that although my Goodyear have a max recommended of #125 the Accuride wheels of this era recommend a max. of #120. I weighed my 2002 Endeavor not to long ago and I was under by #100 on the front and #200 0n the rear. I consider myself fairly loaded down for whatever that's worth.
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"weekend tailgater" 2003 Fleetwood Revolution 40C, 2Vino Scooters hitch rack or H-D FLSTC & XL1200 So. Ga. Cargo Enclsd Trailer-Prodigy wireless brake controller
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06-01-2019, 10:30 AM
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#9
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,746
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Quote:
Originally Posted by wildtoad
You can of course keep things simple, and use the pressure stated on the federally mandated, manufacturer produced placard in your motorhome. No weighing required. If for some reason you don’t like the ride and believe lowering the tire pressure will help, then by all means go get it weighed and adjust accordingly.
One has to wonder why my Goodyear tires state on the tire to use the placard weights.
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This is the tire pressures most tire manufacturers want you to use!!
You should find this placard on the wall beside the drivers seat, usually down by the floor. Since your coach is several years old, the tires should have been replaced 2 or more times. Make sure the tire sizes on the placard match the sizes on the sidewalls.
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Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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06-01-2019, 11:08 AM
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#10
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Senior Member
Join Date: Feb 2015
Location: Grapevine, Tx
Posts: 5,632
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Quote:
Originally Posted by BCam
Remember, the pressures in the tables are the minimum pressures for a given weight. Tireman9, an IRV2 member is a retired tire engineer and he recommends inflating to 10% more than the table psi.
You might want to look for and read the many postings by Tireman9 for more information.
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If the minimum wasn't good enough, it wouldn't be the minimum...
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06-01-2019, 03:29 PM
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#11
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Senior Member
Monaco Owners Club
Join Date: Aug 2017
Location: On the road
Posts: 1,920
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Quote:
Originally Posted by LJowdy
Lets start with "There's no Average tire pressure"
The first thing you need to do is to weight the coach fully loaded. All you have to do is to Google "Truck scales near me" and it will give you a list of vendors.
The best way to weigh the coach is all 4 corners but, most just weight the front then the whole coach and subtract the front from the total for the rear axle weight.
Once you have this info. Google the Tire manufacturer of your current tires and find their weight chart. That will give the tire pressure recommended for the load you're carrying. Anything else is a guess and can cause serious problems if you under-inflate
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The above info is correct by LJowdy...Another place you can weigh your coach is any near by sand & gravel yard...they have to weigh there trucks and most will gladly weigh your MOHO for free.
__________________
Full Time 2000 Dynasty Regent FD, 8.3, Banks Turbo, 5" Diameter Exhaust, 475 HP 1425 Torque, FASS system, towing 05 Pilot 1500 Watts solar 800ah lithium & E-Bike
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06-01-2019, 03:52 PM
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#12
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Senior Member
Join Date: May 2019
Posts: 2,392
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Quote:
Originally Posted by wildtoad
You can of course keep things simple, and use the pressure stated on the federally mandated, manufacturer produced placard in your motorhome. No weighing required. If for some reason you don’t like the ride and believe lowering the tire pressure will help, then by all means go get it weighed and adjust accordingly.
One has to wonder why my Goodyear tires state on the tire to use the placard weights.
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Sometimes keeping things simple is not the best way to do things. It's quite possible to have negative effects from running tires with pressure that is too high, including some which can create a safety issue.
Given the age of the coach under discussion, it's highly unlikely that these are the original tires which came from the factory. So many things could have changed like tire size, tire style, wheels, etc. that basing pressure solely on the manual or sticker is not always the best idea.
If this were my coach, I'd get the correct inflation chart from the tire manufacturer, weigh the coach, and set the tire pressures accordingly. Good idea to check the max pressure on the wheels themselves, as they sometimes have a different max pressure than the tires. Also good to check to be sure that the tires currently mounted are appropriate for the wheels - it's not uncommon for a previous owner to mount tires on a coach which are too wide or too large for the wheels.
Owning and operating a motor home is not a simple thing - it's much more involved than maintaining a car and owners need to do some research from time to time to get things like this locked down.
__________________
Richard
1994 Excella 25-ft (Gertie)
1999 Suburban LS 2500 w/7.4L V8
1974 GMC 4108a - Custom Coach Land Cruiser
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06-01-2019, 04:05 PM
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#13
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Senior Member
Join Date: Jul 2010
Posts: 5,332
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Richard, no real argument with what you say. Just know that on my MH the pressure recommended by Ford, Newmar, and the Goodyear rep I had an email conversation with all support a pressure of 92 (Ford and Newmar placard in the MH) or 95 (Ford chassis brochure, Goodyear rep) all around. Each of these numbers are 10-15 lbs over what I get from the Goodyear tire charts for either the GAWR, or actual weights. So there is some other factors at play in these guys setting a pressure higher than the minimum to support the weight method.
Anyhow, folks will do as they will.
__________________
Tom
2016 Newmar Bay Star Sport 3004
2021 Jeep Gladiator Sport Willys
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06-01-2019, 05:10 PM
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#14
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Senior Member
Winnebago Owners Club
Join Date: May 2010
Location: East Coast Fl
Posts: 1,229
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Quote:
Originally Posted by Timaz
The above info is correct by LJowdy...Another place you can weigh your coach is any near by sand & gravel yard...they have to weigh there trucks and most will gladly weigh your MOHO for free.
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In Florida, you can also just pull into a FDOT weight station. Stay to the far right and when you get to the stop sign, flash your lights to get the attention of the attendant. Once you get their attention, they will come to the door and wave you up to the scales. They will then bring you out your weigh ticket and you can be on your way. I have used them on multiple occasions. It is also a good idea to google Florida weigh stations and call the one you hope to use. They will give you instructions on what to do. I usually use the northbound station in Flagler county north of Ormond Beach and south of St. Augustine on I-95. No charge.
__________________
2016 Arctic Fox 25Y (For Sale), 2016 F350 4x4 DRW, 6.7
2008 Mobile Suites RE3: Sold
2005 Monaco Dynasty Diamond IV: Sold
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