245-70-r16 on the rear?
- Thread starter Ken B
- Start date
Also check max inflation. That may rule them out if not 65 at least.
--
John Lebetski
Woodstock, IL
77 Eleganza II
--
John Lebetski
Woodstock, IL
77 Eleganza II
The first question I have to ask is "WHY"??? The 245 tires can be run on
the coach but only in the rear positions. I would never run it on the
front as it would drop your final drive ration by a +/- 5%. If you thought
that your stock 3.07 ratio was a dog then dropping to a 2.93 ratio will
make it dog with friends. Look I run a 3.67 ratio, which is a combo of a
3.21 final and a 3.50 chain drive drive and I have always used the 225
size on ;the front. You spend all that money to get a proper setup and
screw it up using a bigger tire! Note: All tires should be LRE (load
range E) This is one of the best ratio/tire charts:
http://www.gmceast.com/technical/Brown_Drive_Tire_Ratios.pdf
Now back to the rear of the coach. The 245 tire can be run on the back,
but you must check the clearance between the tire, suspension and air
spring. The 245 tire can rub on the suspension arm assemble, and the air
spring (air bag). "Been There and Done That" and have friend that have
also been there and done that!! That also includes the 4 bag systems. I
have always run what they call an "Air Bag Protector" on all coaches that
we have owned. They are also used as a stone guard. Only picture I could
find, it I was home I would show what I use. There are several different
designs, but they all seem to provide protection between the larger tire
and air bag and you will see the rub marks on the protector.
http://www.gmcmhphotos.com/photos/boggie-straightening-tool/p15055.html
As an example, we have a GMCGL friend who is well known in the GMCMI Bingo
game night who had put on The 245 tire before going on a long trip. This
is the other thing that can bite you in the buns and that is incorrect air
pressure and if you by chance in a situation that the air pressure is lower
for some or any reason you will rub a hole in the bag! He rubbed 3 bags
and put a hole in the 4th. I got a call from him as he was about 40 miles
away and asked if I had a spare air bag, which I did and I ran it out to
his coach and got him on his way. He made sure that the rear suspension
was run up a little higher.
Now this is "MHPO" (My Humble Personal Opinion) on tire sizes and yours can
vary! If you decide that you what to run a larger tire use the 235 tire on
the rear, it will have a little more clearance than the 245 tire. The
225 tire is more than adequate for 99% of our 26" coaches. GMC owner have
been playing this tire game since the first coach was built and believe me
that every combo has been tested and tried and doing the experiment again
and again!
J.R. Wright
GMC Great Laker
GMCGL Tech Editor
GMC Eastern States
GMCMI
TZE Zone Restorations
78 Buskirk Custom 29.5' Stretch
75 Avion (Under going Frame up Restoration)
On Sat, Mar 21, 2020 at 7:19 AM John R. Lebetski via Gmclist <
> Also check max inflation. That may rule them out if not 65 at least.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
the coach but only in the rear positions. I would never run it on the
front as it would drop your final drive ration by a +/- 5%. If you thought
that your stock 3.07 ratio was a dog then dropping to a 2.93 ratio will
make it dog with friends. Look I run a 3.67 ratio, which is a combo of a
3.21 final and a 3.50 chain drive drive and I have always used the 225
size on ;the front. You spend all that money to get a proper setup and
screw it up using a bigger tire! Note: All tires should be LRE (load
range E) This is one of the best ratio/tire charts:
http://www.gmceast.com/technical/Brown_Drive_Tire_Ratios.pdf
Now back to the rear of the coach. The 245 tire can be run on the back,
but you must check the clearance between the tire, suspension and air
spring. The 245 tire can rub on the suspension arm assemble, and the air
spring (air bag). "Been There and Done That" and have friend that have
also been there and done that!! That also includes the 4 bag systems. I
have always run what they call an "Air Bag Protector" on all coaches that
we have owned. They are also used as a stone guard. Only picture I could
find, it I was home I would show what I use. There are several different
designs, but they all seem to provide protection between the larger tire
and air bag and you will see the rub marks on the protector.
http://www.gmcmhphotos.com/photos/boggie-straightening-tool/p15055.html
As an example, we have a GMCGL friend who is well known in the GMCMI Bingo
game night who had put on The 245 tire before going on a long trip. This
is the other thing that can bite you in the buns and that is incorrect air
pressure and if you by chance in a situation that the air pressure is lower
for some or any reason you will rub a hole in the bag! He rubbed 3 bags
and put a hole in the 4th. I got a call from him as he was about 40 miles
away and asked if I had a spare air bag, which I did and I ran it out to
his coach and got him on his way. He made sure that the rear suspension
was run up a little higher.
Now this is "MHPO" (My Humble Personal Opinion) on tire sizes and yours can
vary! If you decide that you what to run a larger tire use the 235 tire on
the rear, it will have a little more clearance than the 245 tire. The
225 tire is more than adequate for 99% of our 26" coaches. GMC owner have
been playing this tire game since the first coach was built and believe me
that every combo has been tested and tried and doing the experiment again
and again!
J.R. Wright
GMC Great Laker
GMCGL Tech Editor
GMC Eastern States
GMCMI
TZE Zone Restorations
78 Buskirk Custom 29.5' Stretch
75 Avion (Under going Frame up Restoration)
On Sat, Mar 21, 2020 at 7:19 AM John R. Lebetski via Gmclist <
> Also check max inflation. That may rule them out if not 65 at least.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
I only have one question. Why?
Jim Hupy
Salem, Oregon
On Sat, Mar 21, 2020, 9:05 AM Ken Burton via Gmclist <
> Load Range D tires inflate to 65 max.
> Load range E tires inflate to 80 max.
>
> I think the number you gave us was the speed rating. I am not sure about
> that.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
Jim Hupy
Salem, Oregon
On Sat, Mar 21, 2020, 9:05 AM Ken Burton via Gmclist <
> Load Range D tires inflate to 65 max.
> Load range E tires inflate to 80 max.
>
> I think the number you gave us was the speed rating. I am not sure about
> that.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
Dan Gregg used to run LT245/75rR 16 LR-E tires on his coach. He had Quad Bags on it and I don't think he ever had issues with any rubbing. It was
tight though.
I run LT245/70R16 on the front of mine on 8" wide wheels. They are about the same diameter as the 225/75s on the rear.
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,
Solar battery charging. GMCSJ and GMCMI member
tight though.
I run LT245/70R16 on the front of mine on 8" wide wheels. They are about the same diameter as the 225/75s on the rear.
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,
Solar battery charging. GMCSJ and GMCMI member
Rich, what's to keep you from coming to a rally/vacation/whatever in your coach to this country and by oprearrangement spending a day at a tire store
while they put new ones on the coach. Surely the Canadian Michelin dealer will warrant Michelins pretty much regardless where you got them?
--johnny
--
Foolish Carriage, 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
while they put new ones on the coach. Surely the Canadian Michelin dealer will warrant Michelins pretty much regardless where you got them?
--johnny
--
Foolish Carriage, 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
Load range 111 is good for up to 2400 lbs, at rated pressure
If the max pressure is 55, and it is rated at 2400, why do you need 10 more lbs of pressure?
--
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen
guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
If the max pressure is 55, and it is rated at 2400, why do you need 10 more lbs of pressure?
--
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen
guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
I was planning to run Lt 245/70r16 on the fronts for a 7" rim. The numerical load range seems to be taking over.
As I understand it, D used to be 8 ply, E used to be 10 ply sidewalls. But I was told it is no longer literal, but an equivalence. 115 seems to
cross over to "e"
Any tire experts want to chime in?
> Dan Gregg used to run LT245/75rR 16 LR-E tires on his coach. He had Quad Bags on it and I don't think he ever had issues with any rubbing. It
> was tight though.
>
> I run LT245/70R16 on the front of mine on 8" wide wheels. They are about the same diameter as the 225/75s on the rear.
--
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen
guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
As I understand it, D used to be 8 ply, E used to be 10 ply sidewalls. But I was told it is no longer literal, but an equivalence. 115 seems to
cross over to "e"
Any tire experts want to chime in?
> Dan Gregg used to run LT245/75rR 16 LR-E tires on his coach. He had Quad Bags on it and I don't think he ever had issues with any rubbing. It
> was tight though.
>
> I run LT245/70R16 on the front of mine on 8" wide wheels. They are about the same diameter as the 225/75s on the rear.
--
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen
guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
That would be fine for a static (standing still) load but when driving you get up and down or hit pot holes, etc which gives you a varying load on the tires which could exceed the 2400 lbs. thus the need for a little more pressure.
Emery Stora
77 Kingsley
Frederick CO
>
> Load range 111 is good for up to 2400 lbs, at rated pressure
>
> If the max pressure is 55, and it is rated at 2400, why do you need 10 more lbs of pressure?
> --
> 76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen
> guys were really thinking about us second hand owners by including that beverage center...
> Columbia, SC.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Emery Stora
77 Kingsley
Frederick CO
>
> Load range 111 is good for up to 2400 lbs, at rated pressure
>
> If the max pressure is 55, and it is rated at 2400, why do you need 10 more lbs of pressure?
> --
> 76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen
> guys were really thinking about us second hand owners by including that beverage center...
> Columbia, SC.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
thanks, Emory,
So it appears there are now two different tire measurements where there used to be one. The letter rating on an "LT" tire is a measure of sidewall
strength. The number is the weight rating. It appears you could buy a proper weight rated tire with a passenger style, 4 ply equivalent,
sidewall.
Found this on discount tire's site that helped explain it.
https://www.discounttire.com/learn/load-range-load-index
In my shopping around , tire retailers either don't have the information, or do not always publish both numbers. It is confusing trying to find the
right tire. As a working stiff, these things age out fast, so I'm always looking for the right deal. My eight year old Firestone's barely got the
nubs knocked off.
> That would be fine for a static (standing still) load but when driving you get up and down or hit pot holes, etc which gives you a varying load on
> the tires which could exceed the 2400 lbs. thus the need for a little more pressure.
>
> Emery Stora
> 77 Kingsley
> Frederick CO
>
> >
> > Load range 111 is good for up to 2400 lbs, at rated pressure
> >
> > If the max pressure is 55, and it is rated at 2400, why do you need 10 more lbs of pressure?
> > --
> > 76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those
> > Coachmen
> > guys were really thinking about us second hand owners by including that beverage center...
> > Columbia, SC.
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
--
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen
guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
So it appears there are now two different tire measurements where there used to be one. The letter rating on an "LT" tire is a measure of sidewall
strength. The number is the weight rating. It appears you could buy a proper weight rated tire with a passenger style, 4 ply equivalent,
sidewall.
Found this on discount tire's site that helped explain it.
https://www.discounttire.com/learn/load-range-load-index
In my shopping around , tire retailers either don't have the information, or do not always publish both numbers. It is confusing trying to find the
right tire. As a working stiff, these things age out fast, so I'm always looking for the right deal. My eight year old Firestone's barely got the
nubs knocked off.
> That would be fine for a static (standing still) load but when driving you get up and down or hit pot holes, etc which gives you a varying load on
> the tires which could exceed the 2400 lbs. thus the need for a little more pressure.
>
> Emery Stora
> 77 Kingsley
> Frederick CO
>
> >
> > Load range 111 is good for up to 2400 lbs, at rated pressure
> >
> > If the max pressure is 55, and it is rated at 2400, why do you need 10 more lbs of pressure?
> > --
> > 76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those
> > Coachmen
> > guys were really thinking about us second hand owners by including that beverage center...
> > Columbia, SC.
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
--
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen
guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
Hi All,
Been following this thread on tires. I when looking at the load index vs
the load range and also chatted with the Tire Rack Rep.The 111 load index
makes is a 4 to 6 ply tire typically for passenger car use. You need to be
between a 115 to 120 load index. better in the 120/121 index, in other
words you want a LRE rated tire which is a 10 ply tire. Now with the LRE
tire does say on the side of the tire that 80 psig and that is for running
the tire under its max load. I do know some that run the tire at 80 psig
but it is a rough ride. I have always found that the best ride is 65 psig
all the way around the stretch coach. With the 26 footers 60 psig on the
front and 55 on the back
I am not going to tell you which tire to buy, I am just typing that I would
not put a 111 load index tire on a GMC coach. Your looking for disaster!
J.R. Wright
GMC Great Laker
GMCGL Tech Editor
GMC Eastern States
GMCMHI
TZE Zone Restorations
78 Buskirk Custom 29.5' Stretch
75 Avion (Under going Frame up Restoration)
On Sun, Mar 22, 2020 at 10:53 AM Joe Weir via Gmclist <
> thanks, Emory,
>
> So it appears there are now two different tire measurements where there
> used to be one. The letter rating on an "LT" tire is a measure of
> sidewall
> strength. The number is the weight rating. It appears you could buy
> a proper weight rated tire with a passenger style, 4 ply equivalent,
> sidewall.
>
> Found this on discount tire's site that helped explain it.
> https://www.discounttire.com/learn/load-range-load-index
>
>
> In my shopping around , tire retailers either don't have the information,
> or do not always publish both numbers. It is confusing trying to find the
> right tire. As a working stiff, these things age out fast, so I'm always
> looking for the right deal. My eight year old Firestone's barely got the
> nubs knocked off.
>
>
>
> > That would be fine for a static (standing still) load but when driving
> you get up and down or hit pot holes, etc which gives you a varying load on
> > the tires which could exceed the 2400 lbs. thus the need for a little
> more pressure.
> >
> > Emery Stora
> > 77 Kingsley
> > Frederick CO
> >
> > >
> > > Load range 111 is good for up to 2400 lbs, at rated pressure
> > >
> > > If the max pressure is 55, and it is rated at 2400, why do you need
> 10 more lbs of pressure?
> > > --
> > > 76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator,
> brakes, Sully airbags, fuel lines, seats, adult beverage center... those
> > > Coachmen
> > > guys were really thinking about us second hand owners by including
> that beverage center...
> > > Columbia, SC.
> > >
> > > _______________________________________________
> > > GMCnet mailing list
> > > Unsubscribe or Change List Options:
> > > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> --
> 76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator,
> brakes, Sully airbags, fuel lines, seats, adult beverage center... those
> Coachmen
> guys were really thinking about us second hand owners by including that
> beverage center...
> Columbia, SC.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
Been following this thread on tires. I when looking at the load index vs
the load range and also chatted with the Tire Rack Rep.The 111 load index
makes is a 4 to 6 ply tire typically for passenger car use. You need to be
between a 115 to 120 load index. better in the 120/121 index, in other
words you want a LRE rated tire which is a 10 ply tire. Now with the LRE
tire does say on the side of the tire that 80 psig and that is for running
the tire under its max load. I do know some that run the tire at 80 psig
but it is a rough ride. I have always found that the best ride is 65 psig
all the way around the stretch coach. With the 26 footers 60 psig on the
front and 55 on the back
I am not going to tell you which tire to buy, I am just typing that I would
not put a 111 load index tire on a GMC coach. Your looking for disaster!
J.R. Wright
GMC Great Laker
GMCGL Tech Editor
GMC Eastern States
GMCMHI
TZE Zone Restorations
78 Buskirk Custom 29.5' Stretch
75 Avion (Under going Frame up Restoration)
On Sun, Mar 22, 2020 at 10:53 AM Joe Weir via Gmclist <
> thanks, Emory,
>
> So it appears there are now two different tire measurements where there
> used to be one. The letter rating on an "LT" tire is a measure of
> sidewall
> strength. The number is the weight rating. It appears you could buy
> a proper weight rated tire with a passenger style, 4 ply equivalent,
> sidewall.
>
> Found this on discount tire's site that helped explain it.
> https://www.discounttire.com/learn/load-range-load-index
>
>
> In my shopping around , tire retailers either don't have the information,
> or do not always publish both numbers. It is confusing trying to find the
> right tire. As a working stiff, these things age out fast, so I'm always
> looking for the right deal. My eight year old Firestone's barely got the
> nubs knocked off.
>
>
>
> > That would be fine for a static (standing still) load but when driving
> you get up and down or hit pot holes, etc which gives you a varying load on
> > the tires which could exceed the 2400 lbs. thus the need for a little
> more pressure.
> >
> > Emery Stora
> > 77 Kingsley
> > Frederick CO
> >
> > >
> > > Load range 111 is good for up to 2400 lbs, at rated pressure
> > >
> > > If the max pressure is 55, and it is rated at 2400, why do you need
> 10 more lbs of pressure?
> > > --
> > > 76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator,
> brakes, Sully airbags, fuel lines, seats, adult beverage center... those
> > > Coachmen
> > > guys were really thinking about us second hand owners by including
> that beverage center...
> > > Columbia, SC.
> > >
> > > _______________________________________________
> > > GMCnet mailing list
> > > Unsubscribe or Change List Options:
> > > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> --
> 76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator,
> brakes, Sully airbags, fuel lines, seats, adult beverage center... those
> Coachmen
> guys were really thinking about us second hand owners by including that
> beverage center...
> Columbia, SC.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
