Home » Public Forums » GMCnet » Weight On Each Wheel - How To Measure?
| Weight On Each Wheel - How To Measure? [message #147612] |
Sun, 23 October 2011 21:24  |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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How would one get the weight on each wheel to get the tire pressure right if there are no commercial scales around?
The only scale I know of within 50 miles of my location that can weigh something this big would only give me total weight and not broken down by left-front, left-mid, left-rear, etc.
Any ideas?
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| Re: Weight On Each Wheel - How To Measure? [message #147650 is a reply to message #147612] |
Mon, 24 October 2011 09:31  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| ahamilto wrote on Sun, 23 October 2011 22:24 |
How would one get the weight on each wheel to get the tire pressure right if there are no commercial scales around?
The only scale I know of within 50 miles of my location that can weigh something this big would only give me total weight and not broken down by left-front, left-mid, left-rear, etc.
Any ideas?
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Aham,
Not having any idea where you geographically is an impediment. I know Alabama has truck scales, I've seen them. There are also graineries, feed mills, cotton gins and metal scrap dealers that have truck scales. You could be anywhere in the 200+x325 mile state, but there is probably one closer by than you expect.
Someplace has got to have one that is set close enough to grade that you can get on it one wheel at a time. This usually takes help form someone standing on the ground.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Weight On Each Wheel - How To Measure? [message #147670 is a reply to message #147612] |
Mon, 24 October 2011 13:15 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Stop my my hanger, or Alex and Jeff Sirum's, or go to most GMCMI rallies. All usually have scales available. Many police departments also have them. Ask around. Mine came from the Pennsylvania DOT.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Weight On Each Wheel - How To Measure? [message #147674 is a reply to message #147650] |
Mon, 24 October 2011 13:55 |
Dwayne
Messages: 418
Registered: October 2007
Location: White Rock BC
Karma: 0
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When importing a GMC into Canada the one stipulation in Canada is the coach
has to be weighed at the Official weight scales. First thing before you can
get insurance.
No CO2 testing.
No mechanical check to pass. ( have to with a car)
No special drivers license.
No Duty.
However we must pay the HST (12%)
I know some of the guys working the scale and will take the coach there and
have each wheel done. However you will have to wait until I install the
just arrived - air compressor. Right now Sharon and I are enjoying the
warmth and sunshine of Hawaii celebrating our 40th.
Will post the findings.
Best regards
Dwayne Jacobson
White Rock BC
77 Eleganza II (now used by our children and maintained and insured by us)
77 Kingsley
69 Avanti II
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Dwayne & Sharon Jacobson
White Rock, BC
77 Eleganza II
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| Re: [GMCnet] Weight On Each Wheel - How To Measure? [message #147684 is a reply to message #147682] |
Mon, 24 October 2011 15:39 |
Dave Mumert
Messages: 272
Registered: February 2004
Location: Olds, AB, Canada
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Hi Rob
Check here
http://www.michelinrvtires.com/assets/pdf/RVTiresBrochure.pdf
Dave
> Subject: Re: [GMCnet] Weight On Each Wheel - How To Measure?
>
> 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.
>
> -----Original Message-----
> From: A.
>
> How would one get the weight on each wheel to get the tire pressure right
if
> there are no commercial scales around?
> The only scale I know of within 50 miles of my location that can weigh
> something this big would only give me total weight and not broken down by
> left-front, left-mid, left-rear, etc.
> Any ideas?
> --
> '73 23' CanyonLands
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| Re: [GMCnet] Weight On Each Wheel - How To Measure? [message #147685 is a reply to message #147682] |
Mon, 24 October 2011 15:48 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Rob,
This is also good reading...
http://www.gmcws.org/Tech/TireSafety/index.html
If it were me -- and until I could weigh the coach properly -- I would look at the weigh-in results from some of the rallies for a model like mine and use it as a baseline.
Dennis
| 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.
-----Original Message-----
From: A.
How would one get the weight on each wheel to get the tire pressure right if there are no commercial scales around?
The only scale I know of within 50 miles of my location that can weigh something this big would only give me total weight and not
broken down by left-front, left-mid, left-rear, etc.
Any ideas?
--
'73 23' CanyonLands
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Weight On Each Wheel - How To Measure? [message #147690 is a reply to message #147682] |
Mon, 24 October 2011 16:46 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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| 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.
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| Re: [GMCnet] Weight On Each Wheel - How To Measure? [message #147694 is a reply to message #147690] |
Mon, 24 October 2011 16:50 |
George DV
Messages: 132
Registered: August 2004
Karma: 0
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Senior Member |
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This mail coincides with the wrong holiday; save it for April 1 not
Halloween
George DV
_____________
/ ][ ] [ ] [ ] \
o O-----------O-----O-o
1976 GLENBROOK
TZE166V 100976
455 HEI 3.70
225 UniroyalsAlcoas
Beautiful Upstate NY
----- Original Message -----
From: "A." <markbb1@netzero.com>
To: <gmclist@temp.gmcnet.org>
Sent: Monday, October 24, 2011 5:46 PM
Subject: Re: [GMCnet] Weight On Each Wheel - How To Measure?
>
>
> 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
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: Weight On Each Wheel - How To Measure? [message #147695 is a reply to message #147612] |
Mon, 24 October 2011 16:55 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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| ahamilto wrote on Sun, 23 October 2011 22:24 |
How would one get the weight on each wheel to get the tire pressure right if there are no commercial scales around?
The only scale I know of within 50 miles of my location that can weigh something this big would only give me total weight and not broken down by left-front, left-mid, left-rear, etc.
Any ideas?
|
Sir: most Alabama DOT carry portable scales in their trunk. All the ones in Ala I have met were very nice people. I would suggest asking one if they would weigh it for you.
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Weight On Each Wheel - How To Measure? [message #147702 is a reply to message #147700] |
Mon, 24 October 2011 17:26 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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| George DV wrote on Mon, 24 October 2011 17:01 |
Individual Wheel load to the earth is a dynamic variable on a moving vehicle..
Variability is huge, far beyond the potential static imbalance of side to side or front to rear.
[Just imagine hitting a pothole, for example.]
George DV
_____________
/ ][ ] [ ] [ ] \
o O-----------O-----O-o
1976 GLENBROOK
TZE166V 100976
455 HEI 3.70
225 UniroyalsAlcoas
Beautiful Upstate NY
|
We must be talking about two different situations. I need to get the correct amount of air in each tire for the amount of weight on the tire. Like everyone else, I have a tire gauge that is applied to each tire in turn when the vehicle is stationary. The amount of weight on each tire determines the correct inflation pressure for that tire. I understand there is some variability with live loads in these motorhomes, but I can get to within a couple pounds of the "ideal" pressure if I know the static weight on the axle at that instant in time.
See here http://gmcmotorhome.info/tires.html for the load/inflation pressure table and here http://www.gmcws.org/Tech/TireSafety/index.html for some info on why you don't want to overinflate or underinflate a tire.
The load on each tire is different so a correct inflation pressure needs to be applied for each tire individually.
If you just put in the max pressure for the load range of the tire, it is almost certainly overinflated, reducing tread life, decreasing traction, and adversely affecting ride quality and handling.
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| Re: [GMCnet] Weight On Each Wheel - How To Measure? [message #147742 is a reply to message #147702] |
Mon, 24 October 2011 22:59 |
Don A
Messages: 895
Registered: October 2008
Location: Dallas, TX
Karma: 0
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Senior Member |
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Wouldn't it be far better to adjust the weight in the coach so the pressure was the same side to side?
<<<<<. I need to get the correct amount of air in each tire for the amount of weight on the tire. >>>>>
Don Adams Dallas, TX
'76 26' Glenbrook, '90 Sidekick
rebuilt by R Archer, powered by J Bounds, Koba
[IMG]http://www.gmcmhphotos.com/photos/data/6109/G2.jpg[/IMG]
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| Re: [GMCnet] Weight On Each Wheel - How To Measure? [message #147743 is a reply to message #147690] |
Mon, 24 October 2011 23:07 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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A,
As Stan in South Park says; "I learned something today."
Section 10 Wheels & Tires provides the general cautions regarding tire inflation and on Page 10-10 Specifications notes to inflate
the tires 60 psi cold and 70 psi for sustained speeds above 65 mph.
I've been running 65 in the fronts and 60 in the rears and it seems to be OK. HOWEVER, I will weigh Double Trouble and balance the
load as well as possible and then set the ride height and tire pressure accordingly.
Thanks!
Rob M.
-----Original Message-----
From: A.
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.
--
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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