| Re: [GMCnet] Weight On Each Wheel - How To Measure? [message #147703] |
Mon, 24 October 2011 17:23  |
rallymaster
Messages: 662
Registered: February 2004
Location: North Plains, ORYGUN
Karma:
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Clip from Michelin tire data pdf. at:
http://www.michelinrvtires.com/assets/pdf/RVTiresBrochure.pdf
---------
Let’ s consider an RV running on 275/80R22.5
MICHELIN®
XZA3®+ EVERTREAD LRG tires, with actual
corner weights of 5,400 lbs. on the left front tire,
5,175 lbs. on the right front tire, 8,500 lbs. on the left
rear duals, and 9,200 lbs. on the right rear duals. For
control of the RV, it is critical that the tire pressures be
the same across an axle. Therefore, we must “overinflate”
the right front tire and the left rear duals. Checking the
load/inflation table below shows that a cold tire pressure
of 95 psi will support 5,510 lbs. on a single front tire.
To determine the pressure for the rear duals, again
take the heaviest position, in this instance the right rear
weighs 9,200 lbs. The load/inflation table below shows
that a cold pressure of 85 psi will support 9,380 lbs. on
2 dual tires. It is important to note that the cold inflation
pressure for the tire must never exceed the maximum
inflation rating that is stamped on the wheel.
REMEMBER: For control of the RV, it is critical that the
tire pressures are the same on both sides of an axle.
On Mon, 24 Oct 2011 16:46:49 -0500 A. <markbb1@netzero.com> writes:
>
>
> Robert Mueller wrote on Mon, 24 October 2011 15:31
> > G'day A.,
> >
> > I'm confused or maybe I'm just misreading the question below.
> >
> > I have never heard of the requirement that you have to adjust tire
> pressures by the weight on each wheel separately.
> >
> > I checked the Maintenance Manual and there's nothing about doing
> so in there.
> >
> > Regards,
> > Rob M.
> Rob,
>
> I don't know if it is in the maintenance manual, but to get the
> correct amount of area of tread in contact with the pavement, for
> traction, braking and wear, and to keep the sidewalls at the proper
> profile, to prevent the plies from wearing out and also to correctly
> absorb road impacts, each tire would need to be inflated based on
> the weight on it.
> With the design of the rear end, both tires on a side are probably
> real close to the same, but the load can be a lot different from one
> side to the other and also front to back, and for both fronts. If
> the load is more than 250 pounds different on one side of the front
> than the other, it is out of spec and some cargo needs to be
> rearranged. In my case, I need someone or something in the
> passenger seat because I weight 275 pounds, putting the front end
> out of spec just by being in it.
> I wouldn't just weigh the motorhome and divide the weight by 6 and
> inflate each tire the same. That would make some over-inflated and
> some underinflated, shortening the life expectancy of the tires,
> potentially increasing braking distance, and maybe costing MPG. Not
> to mention ride quality and handling.
> --
> '73 23' CanyonLands
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Ron & Linda Clark
1978 Eleganza II
North Plains, ORYGUN
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Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II
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