Overloading Tires

Of course, the loading is determined by the load rating based on inflation.
The nominal load rating is based on full inflation (80 psi for Load Range
E, as we usually use).

Looking at Goodyear's chart, the maximum load for a light truck tire at 80
psi is 2680 pounds (65 mph top speed). Last I weighed my coach, it was 5725
pounds on the rear. Half of that is 2862, which overloads a fully inflated
E-range tire by 7%. So, if I was facing that eventuality, and had the
capability to lift a dead tire, I would first put the dead tire on the
middle axle (to move the pivot point back and increase the load on the
front tire), and then inflate the good tire to 80 psi. Then, I would go
slow for the minimum possible time (Goodyear recommends no faster than 55
for a 9% overload). Since I don't have those capabilities, I won't worry
about it. :)

I usually run 50 psi in the rear. According to the chart, the maximum rear
tire weight of 1500 pounds for my early, lightweight coach needs 40 psi,
and I add 10 psi for higher speeds, per their chart. At that pressure, the
65mph-limited load is 1765. 2862 is a 65% overload, for which Goodyear
recommends a 10 psi increase in pressure and a 14 mph speed limit. But
because the tire is well below it's rated pressure, I can increase it to 80
psi and have only a 7% overload.

If my rear weight was 2000 pounds per tire (8000 pounds total on the rear),
Goodyear wants me to run 55 psi in the rear, plus the 10 psi for high
speeds. 4000 pounds on one tire (with the other lifted) would be a 50%
overload of an E-range tire at 80 psi. Goodyear suggests I can carry that
load if I inflate the tire above its maximum rated inflation by 10 psi and
limit my speed to 14 mph.

Here's the Goodyear chart, which includes advice for overloads:
https://www.goodyeartrucktires.com/pdf/resources/publications/2010_loadinflation.pdf

Rick "You brought your second purse? Well, dammit, I have to recalculate
all my inflation pressures!" Denney

On Thu, Nov 16, 2017 at 7:54 AM, Ken Henderson
wrote:

> There's not much information here, but the little there is can contribute
> to the recurring discussion of whether to run on one rear tire:
>
> http://rvtravel.com/replace-tires-can-drive-one-dual/
>
> Ken H.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
'73 X-Glacier 230 "Jaws"
Northern Virginia
Offlist email: rick at rickdenney dot com
 
G'day,

Below you will find the email I send in every time this subject comes up.

OPERATING A GMC ON LESS THAN FOUR REAR WHEELS/TIRES

REFERENCE: GMC Motorhome Operating Manual X-7821A Page 1 - IMPORTANT INFORMATION ON VEHICLE LOADING.

http://www.bdub.net/manuals/X7821A.zip

GVWR (Gross Vehicle Weight Rating) represents the maximum permissible loaded weight of the vehicle.

26 foot GMC GVWR = 12,500 lbs

GAWR (Gross Axle Weight Rating) the maximum weight that the axle can carry.

26 foot GMC GAWR

GAWR = 4,500 lbs Front Wheels
GAWR = 8,000 lbs Rear Wheels

REFERENCE: Tire Load Range: http://bdub.net/gmcmotorhome.info/tires.html

Tire Load Range: The max load a tire can carry and the pressure required to carry that load.

D load range max load @ 65 PSI = 2,235 pounds

E load range tire max load @ 80 psi = 2,680 pounds

REFERENCE: Alcoa Light Truck, SUV, RV and Motorhome Wheels Fitment Guide

http://www.southwestwheel.com/pictures5/LTFitment-Screen_10-18-01.pdf

P/N: 160231
Style: Classic
Max Wheel Load Pounds: 2780
Capacity ratings as dual or single in highway service - bias-ply or radial

P/N: 160251
Style: LTS 5
Max Wheel Load Pounds: 2440
Capacity ratings as dual or single in highway service - bias-ply or radial

P/N: 161251
Style: Hot Shot
Max Wheel Load Pounds: 2780
Capacity ratings as dual or single in highway service - bias-ply or radial

COMMENTS:

The weight distribution per tire would be dependant on the how much pressure was supplied to the air bag supporting the remaining
tire. For ease of calculations we'll divide the rear GAWR of 8,000 lbs as noted above by four which results in a load per tire of
2,000 lbs. Operating the GMC with one wheel removed the load on the remaining tire would double; going from 2,000 to 4,000 lbs. This
is an overload of 1,765 pounds (~79%) on a D range tire at the maximum pressure of 65 psi and an overload of 1320 pounds (~49%) on
an E load range tire at the maximum pressure of 80 psi. If the tires are not inflated to the pressures noted in the previous
sentence the overload would be even higher.

CONCLUSION:

If you drive your GMC with less than four rear tires supporting the load you WILL be operating the GMC with OVERLOADED TIRE(S) and
OVERLOADED WHEELS!

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Richard Denney
Sent: Thursday, November 16, 2017 8:56 AM
To: gmclist
Subject: Re: [GMCnet] Overloading Tires

Of course, the loading is determined by the load rating based on inflation.
The nominal load rating is based on full inflation (80 psi for Load Range
E, as we usually use).

Looking at Goodyear's chart, the maximum load for a light truck tire at 80
psi is 2680 pounds (65 mph top speed). Last I weighed my coach, it was 5725
pounds on the rear. Half of that is 2862, which overloads a fully inflated
E-range tire by 7%. So, if I was facing that eventuality, and had the
capability to lift a dead tire, I would first put the dead tire on the
middle axle (to move the pivot point back and increase the load on the
front tire), and then inflate the good tire to 80 psi. Then, I would go
slow for the minimum possible time (Goodyear recommends no faster than 55
for a 9% overload). Since I don't have those capabilities, I won't worry
about it. :)

I usually run 50 psi in the rear. According to the chart, the maximum rear
tire weight of 1500 pounds for my early, lightweight coach needs 40 psi,
and I add 10 psi for higher speeds, per their chart. At that pressure, the
65mph-limited load is 1765. 2862 is a 65% overload, for which Goodyear
recommends a 10 psi increase in pressure and a 14 mph speed limit. But
because the tire is well below it's rated pressure, I can increase it to 80
psi and have only a 7% overload.

If my rear weight was 2000 pounds per tire (8000 pounds total on the rear),
Goodyear wants me to run 55 psi in the rear, plus the 10 psi for high
speeds. 4000 pounds on one tire (with the other lifted) would be a 50%
overload of an E-range tire at 80 psi. Goodyear suggests I can carry that
load if I inflate the tire above its maximum rated inflation by 10 psi and
limit my speed to 14 mph.

Here's the Goodyear chart, which includes advice for overloads:
https://www.goodyeartrucktires.com/pdf/resources/publications/2010_loadinflation.pdf

Rick "You brought your second purse? Well, dammit, I have to recalculate
all my inflation pressures!" Denney
 
I never recommend INTENTIONALLY driving your quad bag equipped coach on 3
tires, EXCEPT to move it and your family out of harms way. We recently had
one of our members coaches totaled, and one family member injured enough to
require an ambulance ride to an emergency hospital, by an oncoming vehicle
colliding with their coach when it was pulled over on the shoulder of the
freeway with the emergency flashers on. Drive it that way only far enough
to remove it from harms way, NO FURTHER.
JIM HUPY
SALEM, OR
78 GMC ROYALE 403

> G'day,
>
> Below you will find the email I send in every time this subject comes up.
>
> OPERATING A GMC ON LESS THAN FOUR REAR WHEELS/TIRES
>
> REFERENCE: GMC Motorhome Operating Manual X-7821A Page 1 - IMPORTANT
> INFORMATION ON VEHICLE LOADING.
>
> http://www.bdub.net/manuals/X7821A.zip
>
> GVWR (Gross Vehicle Weight Rating) represents the maximum permissible
> loaded weight of the vehicle.
>
> 26 foot GMC GVWR = 12,500 lbs
>
> GAWR (Gross Axle Weight Rating) the maximum weight that the axle can carry.
>
> 26 foot GMC GAWR
>
> GAWR = 4,500 lbs Front Wheels
> GAWR = 8,000 lbs Rear Wheels
>
> REFERENCE: Tire Load Range: http://bdub.net/gmcmotorhome.info/tires.html
>
> Tire Load Range: The max load a tire can carry and the pressure required
> to carry that load.
>
> D load range max load @ 65 PSI = 2,235 pounds
>
> E load range tire max load @ 80 psi = 2,680 pounds
>
> REFERENCE: Alcoa Light Truck, SUV, RV and Motorhome Wheels Fitment Guide
>
> http://www.southwestwheel.com/pictures5/LTFitment-Screen_10-18-01.pdf
>
> P/N: 160231
> Style: Classic
> Max Wheel Load Pounds: 2780
> Capacity ratings as dual or single in highway service - bias-ply or radial
>
> P/N: 160251
> Style: LTS 5
> Max Wheel Load Pounds: 2440
> Capacity ratings as dual or single in highway service - bias-ply or radial
>
> P/N: 161251
> Style: Hot Shot
> Max Wheel Load Pounds: 2780
> Capacity ratings as dual or single in highway service - bias-ply or radial
>
> COMMENTS:
>
> The weight distribution per tire would be dependant on the how much
> pressure was supplied to the air bag supporting the remaining
> tire. For ease of calculations we'll divide the rear GAWR of 8,000 lbs as
> noted above by four which results in a load per tire of
> 2,000 lbs. Operating the GMC with one wheel removed the load on the
> remaining tire would double; going from 2,000 to 4,000 lbs. This
> is an overload of 1,765 pounds (~79%) on a D range tire at the maximum
> pressure of 65 psi and an overload of 1320 pounds (~49%) on
> an E load range tire at the maximum pressure of 80 psi. If the tires are
> not inflated to the pressures noted in the previous
> sentence the overload would be even higher.
>
> CONCLUSION:
>
> If you drive your GMC with less than four rear tires supporting the load
> you WILL be operating the GMC with OVERLOADED TIRE(S) and
> OVERLOADED WHEELS!
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces] On Behalf Of
> Richard Denney
> Sent: Thursday, November 16, 2017 8:56 AM
> To: gmclist
> Subject: Re: [GMCnet] Overloading Tires
>
> Of course, the loading is determined by the load rating based on inflation.
> The nominal load rating is based on full inflation (80 psi for Load Range
> E, as we usually use).
>
> Looking at Goodyear's chart, the maximum load for a light truck tire at 80
> psi is 2680 pounds (65 mph top speed). Last I weighed my coach, it was 5725
> pounds on the rear. Half of that is 2862, which overloads a fully inflated
> E-range tire by 7%. So, if I was facing that eventuality, and had the
> capability to lift a dead tire, I would first put the dead tire on the
> middle axle (to move the pivot point back and increase the load on the
> front tire), and then inflate the good tire to 80 psi. Then, I would go
> slow for the minimum possible time (Goodyear recommends no faster than 55
> for a 9% overload). Since I don't have those capabilities, I won't worry
> about it. :)
>
> I usually run 50 psi in the rear. According to the chart, the maximum rear
> tire weight of 1500 pounds for my early, lightweight coach needs 40 psi,
> and I add 10 psi for higher speeds, per their chart. At that pressure, the
> 65mph-limited load is 1765. 2862 is a 65% overload, for which Goodyear
> recommends a 10 psi increase in pressure and a 14 mph speed limit. But
> because the tire is well below it's rated pressure, I can increase it to 80
> psi and have only a 7% overload.
>
> If my rear weight was 2000 pounds per tire (8000 pounds total on the rear),
> Goodyear wants me to run 55 psi in the rear, plus the 10 psi for high
> speeds. 4000 pounds on one tire (with the other lifted) would be a 50%
> overload of an E-range tire at 80 psi. Goodyear suggests I can carry that
> load if I inflate the tire above its maximum rated inflation by 10 psi and
> limit my speed to 14 mph.
>
> Here's the Goodyear chart, which includes advice for overloads:
> https://www.goodyeartrucktires.com/pdf/resources/publications/2010_
> loadinflation.pdf
>
> Rick "You brought your second purse? Well, dammit, I have to recalculate
> all my inflation pressures!" Denney
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
> There's not much information here, but the little there is can contribute
> to the recurring discussion of whether to run on one rear tire:
>
> http://rvtravel.com/replace-tires-can-drive-one-dual/
>
> Ken H.

I had a chance to have an extended discussion with Roger after his presentation at an FMCA rally. He is an interesting fellow.
We really do have much the same situation as a coach with a conventional dual rear wheel wheel, but ours are just tandem instead of dual.

Yes Richard, you and I might just survive pulling that trick, but coaches as light as ours are not common.

Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
 
I agree with limp it to saftey out of harms way. Worst case you replace 2 tires instead of one (flat plus overloaded tire) which is better than
personal injury or accident. I have Firestone bags so not an option for me.
--
John Lebetski
Woodstock, IL
77 Eleganza II
 
The piece pf steel plate I use to keep the bogie drop limited during maintenance will also work to hold a sore paw off the ground while I one-wheel it
slowly to the next exit.

--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
 
I guess after reading all this scientific mumo jumo, I'm glad I carry a AAA RV Plus
card and have a safe working spare on the rear. Also carry everything needed to change
a flat.

jim Galbavy
'73 x-CL ANNIE
Lake Mary, Fl
 
I even carry my cheeeep0 impact wrench from HF. Fire the genset and easy off and on.

--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
 
Last edited by a moderator:
Good luck with that, Johnny. I've got a couple of those 2-1/2"x3/8"x12"
plates. They each have a significant arch, one very significant, from
having been installed when the rear wheels were jacked off the ground
without deflating the air bags. Unless you have 4 bags with individual
shutoff & dump valves, your bar will be VERY bent. Oh yeah -- what will
the "other" end of the bar ride against while bouncing down the road
(albeit slowly)?

Ken H.

On Fri, Nov 17, 2017 at 10:03 AM, Johnny Bridges via Gmclist <

> The piece pf steel plate I use to keep the bogie drop limited during
> maintenance will also work to hold a sore paw off the ground while I
> one-wheel it
> slowly to the next exit.
>
 
Ken,

As the guy that bent one of your plates I was going to bring it up.

Another thing, you showed me the failed bogie that came off Double Trouble when Skip and Mary Newhouse owned it. IIRC the bottom on
one side had cracked away from the vertical part that bolts to the frame right where the bottom joins the vertical part.

I attributed that to someone using something stiffer between the bogie arm and the bogie when the coach was jacked up.

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Ken Henderson
Sent: Friday, November 17, 2017 7:20 PM
To: GMC Mail List
Cc: Johnny Bridges
Subject: Re: [GMCnet] Overloading Tires

Good luck with that, Johnny. I've got a couple of those 2-1/2"x3/8"x12"
plates. They each have a significant arch, one very significant, from
having been installed when the rear wheels were jacked off the ground
without deflating the air bags. Unless you have 4 bags with individual
shutoff & dump valves, your bar will be VERY bent. Oh yeah -- what will
the "other" end of the bar ride against while bouncing down the road
(albeit slowly)?

Ken H.

On Fri, Nov 17, 2017 at 10:03 AM, Johnny Bridges via Gmclist <

> The piece pf steel plate I use to keep the bogie drop limited during
> maintenance will also work to hold a sore paw off the ground while I
> one-wheel it
> slowly to the next exit.
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
They still work good & give me something to remember you by. :-)

​I'm not sure whether the Newhouse bogie was broken by a plate or a
single-side spacer block like Tom Warner distributed.​

Ken H.

On Sat, Nov 18, 2017 at 1:01 AM, Rob Mueller
wrote:

> Ken,
>
> As the guy that bent one of your plates I was going to bring it up.
>
> Another thing, you showed me the failed bogie that came off Double Trouble
> when Skip and Mary Newhouse owned it. IIRC the bottom on
> one side had cracked away from the vertical part that bolts to the frame
> right where the bottom joins the vertical part.
>
> I attributed that to someone using something stiffer between the bogie arm
> and the bogie when the coach was jacked up.
>
 
This is one Whatsisname cut out of a truck spring.. I ran the coach around the block using it without problems, leads me to believe I could make it to
the next exit without problems as long as it was done very slowly. I signed up for the $70 roadside deal from FMCA anyway - at least I can argure
them off the road to some resting place should the need arise.

--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
 
Ken,

I did find two aluminum blocks in Double Trouble when I got it. They were "witness marks" on both of them where something had "dug" into them pretty well!

Now I have "manifolds" on both air bags from Dave Lenzi:

http://www.bdub.net/lenzi/index.html

As you can see they have shutoff valves, tire valve stems, and gages. I can shutoff the air supply and bleed the pressure out of the bags easily when I have a flat tire.

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Ken Henderson
Sent: Saturday, November 18, 2017 6:28 AM
To: GMC Mail List
Subject: Re: [GMCnet] Overloading Tires

They still work good & give me something to remember you by. :-)

​I'm not sure whether the Newhouse bogie was broken by a plate or a
single-side spacer block like Tom Warner distributed.​

Ken H.
 
Those are undoubtedly Warner blocks -- bad juju.

Leigh Harrison supplied a manifold for each side with a ball valve for it
and another for each bag, plus a gauge and a Schrader valve. Most mounted
that in the wheel well. I moved mine to the Generator and "Propane"
compartments so I can reach them when the bags are down.

Ken H.

On Sat, Nov 18, 2017 at 9:16 AM, Rob Mueller
wrote:

> Ken,
>
> I did find two aluminum blocks in Double Trouble when I got it. They were
> "witness marks" on both of them where something had "dug" into them pretty
> well!
>
> Now I have "manifolds" on both air bags from Dave Lenzi:
>
> http://www.bdub.net/lenzi/index.html
>
> As you can see they have shutoff valves, tire valve stems, and gages. I
> can shutoff the air supply and bleed the pressure out of the bags easily
> when I have a flat tire.
>
 
Single sided spacer block? Do you mean a block that only works on one side
at a time?
I've got a block from Tom and use it to lift both bogies simultaneously.
It's a piece of Aluminum barstock 3/4 x 6 x ~2.5".
What's the problem with this? (if it's what you're referring to)

bdub

On Sat, Nov 18, 2017 at 8:45 AM, Ken Henderson
wrote:

> Those are undoubtedly Warner blocks -- bad juju.
>
> Leigh Harrison supplied a manifold for each side with a ball valve for it
> and another for each bag, plus a gauge and a Schrader valve. Most mounted
> that in the wheel well. I moved mine to the Generator and "Propane"
> compartments so I can reach them when the bags are down.
>
> Ken H.
>
> On Sat, Nov 18, 2017 at 9:16 AM, Rob Mueller

>
> > Ken,
> >
> > I did find two aluminum blocks in Double Trouble when I got it. They were
> > "witness marks" on both of them where something had "dug" into them
> pretty
> > well!
> >
> > Now I have "manifolds" on both air bags from Dave Lenzi:
> >
> > http://www.bdub.net/lenzi/index.html
> >
> > As you can see they have shutoff valves, tire valve stems, and gages. I
> > can shutoff the air supply and bleed the pressure out of the bags easily
> > when I have a flat tire.
>
>
 
I also have bent a very substantial piece of bar stock with the bogies. I
don't use them any more since I installed my wireless air system. Those air
bags will put an incredible amount of force on anything you put in their
way, especially with the lever action of the bogies.
Jim Hupy
Salem, Or
78 GMC ROYALE 403

> Single sided spacer block? Do you mean a block that only works on one side
> at a time?
> I've got a block from Tom and use it to lift both bogies simultaneously.
> It's a piece of Aluminum barstock 3/4 x 6 x ~2.5".
> What's the problem with this? (if it's what you're referring to)
>
> bdub
>
> On Sat, Nov 18, 2017 at 8:45 AM, Ken Henderson

>
> > Those are undoubtedly Warner blocks -- bad juju.
> >
> > Leigh Harrison supplied a manifold for each side with a ball valve for it
> > and another for each bag, plus a gauge and a Schrader valve. Most
> mounted
> > that in the wheel well. I moved mine to the Generator and "Propane"
> > compartments so I can reach them when the bags are down.
> >
> > Ken H.
> >
> > On Sat, Nov 18, 2017 at 9:16 AM, Rob Mueller

> >
> > > Ken,
> > >
> > > I did find two aluminum blocks in Double Trouble when I got it. They
> were
> > > "witness marks" on both of them where something had "dug" into them
> > pretty
> > > well!
> > >
> > > Now I have "manifolds" on both air bags from Dave Lenzi:
> > >
> > > http://www.bdub.net/lenzi/index.html
> > >
> > > As you can see they have shutoff valves, tire valve stems, and gages. I
> > > can shutoff the air supply and bleed the pressure out of the bags
> easily
> > > when I have a flat tire.
> >
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
Billy,

The aluminum blocks I saw from Tom were not long enough to support both
arms simultaneously. The load on the bottom of the bogie increases as the
distance from the contact point on the support device decreases, so a very
short bar REALLY loads the bogie bottom.

Ken H.

> Single sided spacer block? Do you mean a block that only works on one side
> at a time?
> I've got a block from Tom and use it to lift both bogies simultaneously.
> It's a piece of Aluminum barstock 3/4 x 6 x ~2.5".
> What's the problem with this? (if it's what you're referring to)
>
> bdub
>
> On Sat, Nov 18, 2017 at 8:45 AM, Ken Henderson

>
> > Those are undoubtedly Warner blocks -- bad juju.
> >
> > Leigh Harrison supplied a manifold for each side with a ball valve for it
> > and another for each bag, plus a gauge and a Schrader valve. Most
> mounted
> > that in the wheel well. I moved mine to the Generator and "Propane"
> > compartments so I can reach them when the bags are down.
> >
> > Ken H.
> >
> > On Sat, Nov 18, 2017 at 9:16 AM, Rob Mueller

> >
> > > Ken,
> > >
> > > I did find two aluminum blocks in Double Trouble when I got it. They
> were
> > > "witness marks" on both of them where something had "dug" into them
> > pretty
> > > well!
> > >
> > > Now I have "manifolds" on both air bags from Dave Lenzi:
> > >
> > > http://www.bdub.net/lenzi/index.html
> > >
> > > As you can see they have shutoff valves, tire valve stems, and gages. I
> > > can shutoff the air supply and bleed the pressure out of the bags
> easily
> > > when I have a flat tire.
> >
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
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