Musicman
Wenatchee, WA
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Joined: 02/28/2002
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I have been seeing several differing ideas relative to the inflation of tires on motor homes. The range seems to be from using the pressure indicated on the tires it self, as "maximum", down to the pressure found on the tire manufacturers load chart based on weight of the rig.
When someone makes reference to "under inflation, are they saying that the tire has been run below the maximum, or below the indicated load pressure? There could be a considerable difference.
Please, lets hear from some tire guys. Opinions I already have.
Thanks in advance.
Musicman
FMCA #F333309
'97 Winnebago Vectra
'01 Blazer LT
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enblethen
Moses Lake, WA USA
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Joined: 01/05/2005
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Under inflation should be bases on actual vehicle load and calculated against the tire manuafactuer's inflation guide for that tire.
I throw the rig's inflation chart in the recycle bin. It is for the best ride.
Remmeber to, that the sidewall marking on many are not maximum but minimum inflation.
Bud
Suzuki XL7 pushing Pace Arrow
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robatthelake
Vancouver Island
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Joined: 08/24/2003
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I had Mine checked the other day while it was in for the Annual Fluid Change. The Tire Guy at the shop felt that the Rears were a bit soft and when He checked they were about 12 Lbs below their recommended 100 PSI ! The Tires are 275....22.5"
I don't know from Nothing so I went along with increasing to 100 , I will check them from time to time to make sure that they stay at that pressure! He did tell Me that the usual reason for these tires to lose pressure is the Valve stems!
Rob & Jean
Dutch Star Diesel Pusher ..Tracker 4X2
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Fishinghat
Western Washington, USA
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Enblethen has it right. Use the actual weight of the rig and the manufacturer's guide for that size tire.
Holiday Rambler Navigator DP, Hummer, and Honda VT1100C Shadow
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parkmanaa
Houston, Tx.
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ONLY use the tire manufacturer's PSI/Weight carrying chart.
Weigh your vehicle first, then follow the charts found on your tire manfucturer's website. All major tire manufacturers have a wealth of advice in addition to these charts, and I personally feel anyone with an RV could spend time wisely studying that information. As indicated above, all vehicle maufacturers are prone to give a less-than-adequate PSI rating so you can obtain the softest ride.
Also, never simply inflate to the PSI indicated on the sidewall. That PSI is good only for the MAXIMUM weight that tire can carry, and if you are having to inflate to that PSI you have no safety margin left, and need a higher load-range, or larger tires.
As to the definition of 'under-inflated', that would be when your tires are not inflated adequately to carry the load.
My educated opinions.
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hwybnb
Southern California
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Joined: 05/02/2001
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This has been discussed ow many times I am surprised there is anyone, especially a Senior Member, that does not know the answer.
The only correct pressure is what you derive from the tire manufacturer's weight / pressure chart using actual weights. It is not the pressure marked on the tire sidewall - that is the minimum pressure IF the tire is carrying its full rated load, but if the RV is properly designed the tire load will be well below that. Any time the tire is inflated (when cold) to less than the pressure indicated by the chart it is under-inflated.
Michelin has a very good booklet and DVD on this subject. They will send it to you if you ask.
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Musicman
Wenatchee, WA
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Thanks guys.
hwybnb, just because I posted the question, does not indicate that I don't know the answer. From what I have been reading about folks inflating to the max on the sidewall, there are some folks on the forum who don't and I thought the information should be presented once again.
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wallynm
Los Alamos NM
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Joined: 09/27/2000
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RV TIRE
I will not give an opinion but will strongly suggest you read the Michelin RV Tire Guide then do as you will
Musicman wrote:I have been seeing several differing ideas relative to the inflation of tires on motor homes. The range seems to be from using the pressure indicated on the tires it self, as "maximum", down to the pressure found on the tire manufacturers load chart based on weight of the rig.
When someone makes reference to "under inflation, are they saying that the tire has been run below the maximum, or below the indicated load pressure? There could be a considerable difference.
Please, lets hear from some tire guys. Opinions I already have.
Thanks in advance.
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wandering1
Texas
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Joined: 06/18/2002
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Ask the tire manufacturer for a definition and quit asking for opinions if you are really interested and post the tire manufacturers facts.
HR
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Jack M.
Calgary, Alberta, Canada
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Joined: 01/26/2005
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I agree that it is a dumb question, and if the OP doesn't want any opinions, then going to the tire manufactures chart, any pressure lower than what the tire position weight on the chart requires is under-inflated.
Jack & Nim Myton
'07 Revolution LE, 40E, DSCVRY "Reveille"
`08 CR-V, `RVPUSHR`
Moderator, FMA Revolution Owners Group, Good Sam, FMCA
www.revolutionmotorhome@yahoogroups.com
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