Tire Question...12R22.5

[Neil & Pat]

Hi Bill, thanks for the reply. I generally do not recommend that we
reengineer our vehicles, I would rather keep it as designed until it was no
longer possible to do so. Note, that I also use the 12R and have had no
problem getting them if I plan ahead just a tad. However, to respond to
your question please consider the following:

The 315/80R22.5 LRH is very close match for the specs of a 12R LRH, in
addition, its available in a LRJ as well giving it a major increase in
capacity. The comparable specs are as follows:

Spec 12R 315/80R
Wheel 9:00 9:00
section width 11.80 12.28
Max dia grown 43.61 43.15
Overall width 12.74 12.91
Tire spacing 13.5 13.82
LRH max load 7390/6780(120psi) 7610/6940(110psi)
LRJ max load na 8270/7610(120psi)

These are the critical numbers; you need to ascertain if the larger tire
will fit the wheel, coach and carry the load. It looks good for everything
except for wheel spacing and this is a critical area that I do not like to
see pushed (it true that some people consider this less critical for MHs
because the are used on highways only). With the correct wheels and
adequate room on the coach the 315/80 looks like an excellent choice, which
will operate at reduced air pressure to enhance the ride; our old coaches do
not have computers so the diameter differences appear to be negligible. I
don’t know how tight the FC coaches are (turning clearance is generally most
critical), you will have to check that out. I also do not know how common
the 315/80 tires are in the marketplace but at least you could use either
the LRH or LRJ at the appropriate pressure.

Regards,

Neil LeKander
Author “The RVer’s Ultimate Survival Guide”
author@...




Hi Neil,

Is there a higher weight rated, larger tire that is more available.
that you would recommend???

The 12R's are not available at many tire stores, usually ordered in
the area that I live, And finding a 12R on the side of the road
with a flat could be a problem. It would really be hard to find a
single matching tire replacement.

Bill 88 FC Michigan

--- In WanderlodgeForum@yahoogroups.com
, "Neil & Pat"
wrote:
>
> Hi John, you have already received several answers to your
inquiry; however,
> I thought that I would add a few additional thoughts. I believe
that what
> you are thinking of doing would not only be ill advised but may be
downright
> dangerous. From my years as a tire engineer and with A' Weigh We
Go
> weighing coaches including many Bluebirds (my own PT-36 included)
I have
> knowledge that most all late 90s Birds are very close to their
maximum GVWR
> or GAWR as delivered and many are over that critical (and legally
> enforceable) limit when operated.
>
> For that reason based on the lessor ability to carry a load the
11R tires
> are in no way suitable for use on your 98 LX. The actual load
capability
> for the 12R and 11R are #6610/7390 & #6780/6005 (single/dual)
respectively,
> thus, you can see that there is a major reduction in the tires
carrying
> capacity, probably less that your coach requires. On the slim
chance that
> your specific coach might be unusually light where the 11R could
carry the
> weight it will require an increase in tire pressure to do so,
something that
> most RVers hate to do because of the ride quality reduction that
accompanies
> higher tire pressures. In addition there is a approximately
a .75" radius
> reduction (affecting your computers and dash readouts) along with
a .80"
> reduction in tread width with a corresponding reduction in tire
footprint
> area (which will increase wear, decrease steering power and
decrease
> stopping power); finally while your current rims will probably be
OK to use
> they are not optimal for the 11R (9:00 vs. 8:25) a fact which will
also
> compromise somewhat the total tire performance
>
> Do not listen to those who are not unbiased experts in just what
tires are
> required for RV usage. Remember also that RV are the only vehicle
on the
> road that "operates at 100% of its capability 100% of the tire."
Tires are
> no place to compromise; there are some very important people on
board your
> coach. Do the right thing and have your coach weighed properly,
> wheel-by-wheel as is done by the RVSEF, only then will you be able
to make
> sound judgments re: tires, pressures, etc. If you have any other
questions
> or if I have misread your original question please do not hesitate
to ask
> additional questions.
>
> Regards,
>
> Neil LeKander
> Author "The RVer's Ultimate Survival Guide"
> author@...
>
> -----Original Message-----
> From: WanderlodgeForum@yahoogroups.com

> [mailto: WanderlodgeForum@yahoogroups.com
]On Behalf Of John
> Sent: Wednesday, October 11, 2006 6:44 PM
> To: WanderlodgeForum@yahoogroups.com

> Subject: [WanderlodgeForum] Tire Question...12R22.5
>
> I have started looking for new tires for our coach as it has the
> origional tires on it. While they are showing no cracking at all,
I am
> still concerned about their age and would like to start swapping
them
> out before I have to do it from the side of the road. The current
> tires are 12R22.5 which seems to be a lot more uncommon than
> 11R22.5s(which I run on my dump truck). From talking to a couple
tire
> people they say the 11R22.5 are a little smaller(shorter). Has
anyone
> switched from the 12s to the 11s? Any recomendations on a
particular
> brand?
>
> Thanks,
> John Cassel
> 98 Wanderlodge LX
>
>
>
> [Non-text portions of this message have been removed]
>



[Non-text portions of this message have been removed]

[Ron & Patty]

John prior owners' put Toyo 11R's on our PT36 (6V92), After we aquired
her, I bought 12R's for the steer. When it's time to change the
rears, I'll go back to 12R's, rotating the present steers to the tag.
I think the only reason to do this is to save about $100 per tire.
I've read Toyo no longer offers RV tires.

Ron, No. California
85PT36

>Has anyone switched from the 12s to the 11s? Any recomendations on a
>particular brand?
>
> Thanks,
> John Cassel
> 98 Wanderlodge LX
>

[Joe Hagan]

As a matter of interest, many - if not most - OTR bus operators that
employ MCI, Prevost, Setra and Van Hool coaches use the 315/80/22.5
tires (Michelin and Goodyear). Weights typically run 52,000-56,000 lbs
on 47-53 passenger coaches (40'-45'. Tire pressure on-average run
S100, D110, T95.

Joe (Pappy) Hagan
St. George, UT
Wannabe

--- In WanderlodgeForum@yahoogroups.com, "Neil & Pat"
wrote:
>
> Hi Bill, thanks for the reply. I generally do not recommend that we
> reengineer our vehicles, I would rather keep it as designed until it
was no
> longer possible to do so. Note, that I also use the 12R and have had
no
> problem getting them if I plan ahead just a tad. However, to respond
to
> your question please consider the following:
>
> The 315/80R22.5 LRH is very close match for the specs of a 12R LRH, in
> addition, its available in a LRJ as well giving it a major increase in
> capacity. The comparable specs are as follows:
>
> Spec 12R 315/80R
> Wheel 9:00 9:00
> section width 11.80 12.28
> Max dia grown 43.61 43.15
> Overall width 12.74 12.91
> Tire spacing 13.5 13.82
> LRH max load 7390/6780(120psi) 7610/6940(110psi)
> LRJ max load na
8270/7610(120psi)
>
> These are the critical numbers; you need to ascertain if the larger
tire
> will fit the wheel, coach and carry the load. It looks good for
everything
> except for wheel spacing and this is a critical area that I do not
like to
> see pushed (it true that some people consider this less critical for
MHs
> because the are used on highways only). With the correct wheels and
> adequate room on the coach the 315/80 looks like an excellent choice,
which
> will operate at reduced air pressure to enhance the ride; our old
coaches do
> not have computers so the diameter differences appear to be
negligible. I
> don't know how tight the FC coaches are (turning clearance is
generally most
> critical), you will have to check that out. I also do not know how
common
> the 315/80 tires are in the marketplace but at least you could use
either
> the LRH or LRJ at the appropriate pressure.
>
> Regards,
>
> Neil LeKander
> Author "The RVer's Ultimate Survival Guide"
> author@...
>
>
>
>
> Hi Neil,
>
> Is there a higher weight rated, larger tire that is more available.
> that you would recommend???
>
> The 12R's are not available at many tire stores, usually ordered in
> the area that I live, And finding a 12R on the side of the road
> with a flat could be a problem. It would really be hard to find a
> single matching tire replacement.
>
> Bill 88 FC Michigan
>
> --- In WanderlodgeForum@yahoogroups.com
> , "Neil & Pat" undoone@
> wrote:
> >
> > Hi John, you have already received several answers to your
> inquiry; however,
> > I thought that I would add a few additional thoughts. I believe
> that what
> > you are thinking of doing would not only be ill advised but may be
> downright
> > dangerous. From my years as a tire engineer and with A' Weigh We
> Go
> > weighing coaches including many Bluebirds (my own PT-36 included)
> I have
> > knowledge that most all late 90s Birds are very close to their
> maximum GVWR
> > or GAWR as delivered and many are over that critical (and legally
> > enforceable) limit when operated.
> >
> > For that reason based on the lessor ability to carry a load the
> 11R tires
> > are in no way suitable for use on your 98 LX. The actual load
> capability
> > for the 12R and 11R are #6610/7390 & #6780/6005 (single/dual)
> respectively,
> > thus, you can see that there is a major reduction in the tires
> carrying
> > capacity, probably less that your coach requires. On the slim
> chance that
> > your specific coach might be unusually light where the 11R could
> carry the
> > weight it will require an increase in tire pressure to do so,
> something that
> > most RVers hate to do because of the ride quality reduction that
> accompanies
> > higher tire pressures. In addition there is a approximately
> a .75" radius
> > reduction (affecting your computers and dash readouts) along with
> a .80"
> > reduction in tread width with a corresponding reduction in tire
> footprint
> > area (which will increase wear, decrease steering power and
> decrease
> > stopping power); finally while your current rims will probably be
> OK to use
> > they are not optimal for the 11R (9:00 vs. 8:25) a fact which will
> also
> > compromise somewhat the total tire performance
> >
> > Do not listen to those who are not unbiased experts in just what
> tires are
> > required for RV usage. Remember also that RV are the only vehicle
> on the
> > road that "operates at 100% of its capability 100% of the tire."
> Tires are
> > no place to compromise; there are some very important people on
> board your
> > coach. Do the right thing and have your coach weighed properly,
> > wheel-by-wheel as is done by the RVSEF, only then will you be able
> to make
> > sound judgments re: tires, pressures, etc. If you have any other
> questions
> > or if I have misread your original question please do not hesitate
> to ask
> > additional questions.
> >
> > Regards,
> >
> > Neil LeKander
> > Author "The RVer's Ultimate Survival Guide"
> > author@
> >
> > -----Original Message-----
> > From: WanderlodgeForum@yahoogroups.com
>
> > [mailto: WanderlodgeForum@yahoogroups.com
> ]On Behalf Of John
> > Sent: Wednesday, October 11, 2006 6:44 PM
> > To: WanderlodgeForum@yahoogroups.com
>
> > Subject: [WanderlodgeForum] Tire Question...12R22.5
> >
> > I have started looking for new tires for our coach as it has the
> > origional tires on it. While they are showing no cracking at all,
> I am
> > still concerned about their age and would like to start swapping
> them
> > out before I have to do it from the side of the road. The current
> > tires are 12R22.5 which seems to be a lot more uncommon than
> > 11R22.5s(which I run on my dump truck). From talking to a couple
> tire
> > people they say the 11R22.5 are a little smaller(shorter). Has
> anyone
> > switched from the 12s to the 11s? Any recomendations on a
> particular
> > brand?
> >
> > Thanks,
> > John Cassel
> > 98 Wanderlodge LX
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
> [Non-text portions of this message have been removed]
>

[smquandt]

315/80/22.5 is what my Kumho Dealer recommended, have two new ones on my
steering. He said it is a more common size than the 12R's.



Steve Quandt

1993-PT40

Iron Mountain, MI



_____

From: WanderlodgeForum@yahoogroups.com
[mailto:WanderlodgeForum@yahoogroups.com] On Behalf Of Joe Hagan
Sent: Thursday, October 12, 2006 1:17 PM
To: WanderlodgeForum@yahoogroups.com
Subject: [WanderlodgeForum] Re: Tire Question...12R22.5



As a matter of interest, many - if not most - OTR bus operators that
employ MCI, Prevost, Setra and Van Hool coaches use the 315/80/22.5
tires (Michelin and Goodyear). Weights typically run 52,000-56,000 lbs
on 47-53 passenger coaches (40'-45'. Tire pressure on-average run
S100, D110, T95.

Joe (Pappy) Hagan
St. George, UT
Wannabe

--- In WanderlodgeForum@
yahoogroups.com, "Neil & Pat"
wrote:
>
> Hi Bill, thanks for the reply. I generally do not recommend that we
> reengineer our vehicles, I would rather keep it as designed until it
was no
> longer possible to do so. Note, that I also use the 12R and have had
no
> problem getting them if I plan ahead just a tad. However, to respond
to
> your question please consider the following:
>
> The 315/80R22.5 LRH is very close match for the specs of a 12R LRH, in
> addition, its available in a LRJ as well giving it a major increase in
> capacity. The comparable specs are as follows:
>
> Spec 12R 315/80R
> Wheel 9:00 9:00
> section width 11.80 12.28
> Max dia grown 43.61 43.15
> Overall width 12.74 12.91
> Tire spacing 13.5 13.82
> LRH max load 7390/6780(120psi) 7610/6940(110psi)
> LRJ max load na
8270/7610(120psi)
>
> These are the critical numbers; you need to ascertain if the larger
tire
> will fit the wheel, coach and carry the load. It looks good for
everything
> except for wheel spacing and this is a critical area that I do not
like to
> see pushed (it true that some people consider this less critical for
MHs
> because the are used on highways only). With the correct wheels and
> adequate room on the coach the 315/80 looks like an excellent choice,
which
> will operate at reduced air pressure to enhance the ride; our old
coaches do
> not have computers so the diameter differences appear to be
negligible. I
> don't know how tight the FC coaches are (turning clearance is
generally most
> critical), you will have to check that out. I also do not know how
common
> the 315/80 tires are in the marketplace but at least you could use
either
> the LRH or LRJ at the appropriate pressure.
>
> Regards,
>
> Neil LeKander
> Author "The RVer's Ultimate Survival Guide"
> author@...
>
>
>
>
> Hi Neil,
>
> Is there a higher weight rated, larger tire that is more available.
> that you would recommend???
>
> The 12R's are not available at many tire stores, usually ordered in
> the area that I live, And finding a 12R on the side of the road
> with a flat could be a problem. It would really be hard to find a
> single matching tire replacement.
>
> Bill 88 FC Michigan
>
> --- In WanderlodgeForum@
yahoogroups.com
> , "Neil & Pat" undoone@
> wrote:
> >
> > Hi John, you have already received several answers to your
> inquiry; however,
> > I thought that I would add a few additional thoughts. I believe
> that what
> > you are thinking of doing would not only be ill advised but may be
> downright
> > dangerous. From my years as a tire engineer and with A' Weigh We
> Go
> > weighing coaches including many Bluebirds (my own PT-36 included)
> I have
> > knowledge that most all late 90s Birds are very close to their
> maximum GVWR
> > or GAWR as delivered and many are over that critical (and legally
> > enforceable) limit when operated.
> >
> > For that reason based on the lessor ability to carry a load the
> 11R tires
> > are in no way suitable for use on your 98 LX. The actual load
> capability
> > for the 12R and 11R are #6610/7390 & #6780/6005 (single/dual)
> respectively,
> > thus, you can see that there is a major reduction in the tires
> carrying
> > capacity, probably less that your coach requires. On the slim
> chance that
> > your specific coach might be unusually light where the 11R could
> carry the
> > weight it will require an increase in tire pressure to do so,
> something that
> > most RVers hate to do because of the ride quality reduction that
> accompanies
> > higher tire pressures. In addition there is a approximately
> a .75" radius
> > reduction (affecting your computers and dash readouts) along with
> a .80"
> > reduction in tread width with a corresponding reduction in tire
> footprint
> > area (which will increase wear, decrease steering power and
> decrease
> > stopping power); finally while your current rims will probably be
> OK to use
> > they are not optimal for the 11R (9:00 vs. 8:25) a fact which will
> also
> > compromise somewhat the total tire performance
> >
> > Do not listen to those who are not unbiased experts in just what
> tires are
> > required for RV usage. Remember also that RV are the only vehicle
> on the
> > road that "operates at 100% of its capability 100% of the tire."
> Tires are
> > no place to compromise; there are some very important people on
> board your
> > coach. Do the right thing and have your coach weighed properly,
> > wheel-by-wheel as is done by the RVSEF, only then will you be able
> to make
> > sound judgments re: tires, pressures, etc. If you have any other
> questions
> > or if I have misread your original question please do not hesitate
> to ask
> > additional questions.
> >
> > Regards,
> >
> > Neil LeKander
> > Author "The RVer's Ultimate Survival Guide"
> > author@
> >
> > -----Original Message-----
> > From: WanderlodgeForum@
yahoogroups.com
>
> > [mailto: WanderlodgeForum@
yahoogroups.com
> ]On Behalf Of John
> > Sent: Wednesday, October 11, 2006 6:44 PM
> > To: WanderlodgeForum@
yahoogroups.com
>
> > Subject: [WanderlodgeForum] Tire Question...12R22.5
> >
> > I have started looking for new tires for our coach as it has the
> > origional tires on it. While they are showing no cracking at all,
> I am
> > still concerned about their age and would like to start swapping
> them
> > out before I have to do it from the side of the road. The current
> > tires are 12R22.5 which seems to be a lot more uncommon than
> > 11R22.5s(which I run on my dump truck). From talking to a couple
> tire
> > people they say the 11R22.5 are a little smaller(shorter). Has
> anyone
> > switched from the 12s to the 11s? Any recomendations on a
> particular
> > brand?
> >
> > Thanks,
> > John Cassel
> > 98 Wanderlodge LX
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
> [Non-text portions of this message have been removed]
>





[Non-text portions of this message have been removed]

[birdshill123]

The 315's will not work with the FC coaches. Mine has 8.25 inch rims.
Toyo does indeed make tires that can be used on an RV. They did get
into a battle with National. Apparently some Country Coaches were
coming from the factory with Toyos. But these coaches were overloaded
on one wheel. They blew tires and CC issued a recall. I guess they
tried to recover the $'s from Toyo. Toyo then issued a notice that
they do not recommend using their tires on any National Coach
product. It appears that Toyo does not advertise them for RV's like
they did previously. I think the problem with finding 12R's is
regional. According to CC owners Les Schwab has 12R's from more than
one manufacturer. They are available in Arizona. Maybe the problem is
an East Coast thing? There are lots of RV'rs that have the same
difficulty finding tires. The infamous Michelin XRV's 235/80 and
255/80 are also very hard to find. For a number of years almost every
Freightliner chassis had one of these tires. For what it is worth I
did a factory tour in 05 of both a Fletwood and a Newmar plant. Both
were using Good Year G670's. Beaudry's lot is full of RV's and almost
every new coach has the Goodyears. Of course this does not mean they
are using them because they are better. Could be just a better price.
Like the XRV's the G670's do have some compounds in them to help
prevent premature cracking due to UV.


Bruce 1988 FC35

[pattypape]

Thanks Neil for the tire info.
We use 12R tires, I do not know the rim width.
I need to check out these numbers, I think I know of
atleast one FC using the 315/80R22.5 , on the front.
The reason, I asked is that our tire shop recommened
315/80R22.5 , Said most other buses and trucks in the area
have switched from The 12R.

Bill 88 FC Michigan


--- In WanderlodgeForum@yahoogroups.com, "Neil & Pat"
wrote:
>
> Hi Bill, thanks for the reply. I generally do not recommend that
we
> reengineer our vehicles, I would rather keep it as designed until
it was no
> longer possible to do so. Note, that I also use the 12R and have
had no
> problem getting them if I plan ahead just a tad. However, to
respond to
> your question please consider the following:
>
> The 315/80R22.5 LRH is very close match for the specs of a 12R
LRH, in
> addition, its available in a LRJ as well giving it a major
increase in
> capacity. The comparable specs are as follows:
>
> Spec 12R
315/80R
> Wheel 9:00 9:00
> section width 11.80 12.28
> Max dia grown 43.61 43.15
> Overall width 12.74 12.91
> Tire spacing 13.5 13.82
> LRH max load 7390/6780(120psi) 7610/6940(110psi)
> LRJ max load na 8270/7610
(120psi)
>
> These are the critical numbers; you need to ascertain if the
larger tire
> will fit the wheel, coach and carry the load. It looks good for
everything
> except for wheel spacing and this is a critical area that I do not
like to
> see pushed (it true that some people consider this less critical
for MHs
> because the are used on highways only). With the correct wheels
and
> adequate room on the coach the 315/80 looks like an excellent
choice, which
> will operate at reduced air pressure to enhance the ride; our old
coaches do
> not have computers so the diameter differences appear to be
negligible. I
> don't know how tight the FC coaches are (turning clearance is
generally most
> critical), you will have to check that out. I also do not know
how common
> the 315/80 tires are in the marketplace but at least you could use
either
> the LRH or LRJ at the appropriate pressure.
>
> Regards,
>
> Neil LeKander
> Author "The RVer's Ultimate Survival Guide"
> author@...
>
>
>
>
> Hi Neil,
>
> Is there a higher weight rated, larger tire that is more available.
> that you would recommend???
>
> The 12R's are not available at many tire stores, usually ordered in
> the area that I live, And finding a 12R on the side of the road
> with a flat could be a problem. It would really be hard to find a
> single matching tire replacement.
>
> Bill 88 FC Michigan
>
> --- In WanderlodgeForum@yahoogroups.com
> , "Neil & Pat"

> wrote:
> >
> > Hi John, you have already received several answers to your
> inquiry; however,
> > I thought that I would add a few additional thoughts. I believe
> that what
> > you are thinking of doing would not only be ill advised but may
be
> downright
> > dangerous. From my years as a tire engineer and with A' Weigh We
> Go
> > weighing coaches including many Bluebirds (my own PT-36 included)
> I have
> > knowledge that most all late 90s Birds are very close to their
> maximum GVWR
> > or GAWR as delivered and many are over that critical (and legally
> > enforceable) limit when operated.
> >
> > For that reason based on the lessor ability to carry a load the
> 11R tires
> > are in no way suitable for use on your 98 LX. The actual load
> capability
> > for the 12R and 11R are #6610/7390 & #6780/6005 (single/dual)
> respectively,
> > thus, you can see that there is a major reduction in the tires
> carrying
> > capacity, probably less that your coach requires. On the slim
> chance that
> > your specific coach might be unusually light where the 11R could
> carry the
> > weight it will require an increase in tire pressure to do so,
> something that
> > most RVers hate to do because of the ride quality reduction that
> accompanies
> > higher tire pressures. In addition there is a approximately
> a .75" radius
> > reduction (affecting your computers and dash readouts) along with
> a .80"
> > reduction in tread width with a corresponding reduction in tire
> footprint
> > area (which will increase wear, decrease steering power and
> decrease
> > stopping power); finally while your current rims will probably be
> OK to use
> > they are not optimal for the 11R (9:00 vs. 8:25) a fact which
will
> also
> > compromise somewhat the total tire performance
> >
> > Do not listen to those who are not unbiased experts in just what
> tires are
> > required for RV usage. Remember also that RV are the only vehicle
> on the
> > road that "operates at 100% of its capability 100% of the tire."
> Tires are
> > no place to compromise; there are some very important people on
> board your
> > coach. Do the right thing and have your coach weighed properly,
> > wheel-by-wheel as is done by the RVSEF, only then will you be
able
> to make
> > sound judgments re: tires, pressures, etc. If you have any other
> questions
> > or if I have misread your original question please do not
hesitate
> to ask
> > additional questions.
> >
> > Regards,
> >
> > Neil LeKander
> > Author "The RVer's Ultimate Survival Guide"
> > author@
> >
> > -----Original Message-----
> > From: WanderlodgeForum@yahoogroups.com
>
> > [mailto: WanderlodgeForum@yahoogroups.com
> ]On Behalf Of John
> > Sent: Wednesday, October 11, 2006 6:44 PM
> > To: WanderlodgeForum@yahoogroups.com
>
> > Subject: [WanderlodgeForum] Tire Question...12R22.5
> >
> > I have started looking for new tires for our coach as it has the
> > origional tires on it. While they are showing no cracking at all,
> I am
> > still concerned about their age and would like to start swapping
> them
> > out before I have to do it from the side of the road. The current
> > tires are 12R22.5 which seems to be a lot more uncommon than
> > 11R22.5s(which I run on my dump truck). From talking to a couple
> tire
> > people they say the 11R22.5 are a little smaller(shorter). Has
> anyone
> > switched from the 12s to the 11s? Any recomendations on a
> particular
> > brand?
> >
> > Thanks,
> > John Cassel
> > 98 Wanderlodge LX
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
> [Non-text portions of this message have been removed]
>

[John]

Thanks Neil, and everyone else that posted...That was very
informative. I had to go by the place I usually get my commercial
tires today and they're looking for me some 12Rs. I Should hear
something about what they can get for me by tomorrow evening or Monday
morning. He thought the Michilens would be around $425 plus mounting
etc. He said he would also check to see what else was available in
that size range. I'll let everyone know what they find out.

Thanks again,
John

--- In WanderlodgeForum@yahoogroups.com, "Neil & Pat" wrote:
>
> Hi John, you have already received several answers to your inquiry;
however,
> I thought that I would add a few additional thoughts. I believe
that what
> you are thinking of doing would not only be ill advised but may be
downright
> dangerous. From my years as a tire engineer and with A' Weigh We Go
> weighing coaches including many Bluebirds (my own PT-36 included) I have
> knowledge that most all late 90s Birds are very close to their
maximum GVWR
> or GAWR as delivered and many are over that critical (and legally
> enforceable) limit when operated.
>
> For that reason based on the lessor ability to carry a load the 11R
tires
> are in no way suitable for use on your 98 LX. The actual load
capability
> for the 12R and 11R are #6610/7390 & #6780/6005 (single/dual)
respectively,
> thus, you can see that there is a major reduction in the tires carrying
> capacity, probably less that your coach requires. On the slim
chance that
> your specific coach might be unusually light where the 11R could
carry the
> weight it will require an increase in tire pressure to do so,
something that
> most RVers hate to do because of the ride quality reduction that
accompanies
> higher tire pressures. In addition there is a approximately a .75"
radius
> reduction (affecting your computers and dash readouts) along with a .80"
> reduction in tread width with a corresponding reduction in tire
footprint
> area (which will increase wear, decrease steering power and decrease
> stopping power); finally while your current rims will probably be OK
to use
> they are not optimal for the 11R (9:00 vs. 8:25) a fact which will also
> compromise somewhat the total tire performance
>
> Do not listen to those who are not unbiased experts in just what
tires are
> required for RV usage. Remember also that RV are the only vehicle
on the
> road that "operates at 100% of its capability 100% of the tire."
Tires are
> no place to compromise; there are some very important people on
board your
> coach. Do the right thing and have your coach weighed properly,
> wheel-by-wheel as is done by the RVSEF, only then will you be able
to make
> sound judgments re: tires, pressures, etc. If you have any other
questions
> or if I have misread your original question please do not hesitate
to ask
> additional questions.
>
> Regards,
>
> Neil LeKander
> Author "The RVer's Ultimate Survival Guide"
> author@...
>
> -----Original Message-----
> From: WanderlodgeForum@yahoogroups.com
> [mailto:WanderlodgeForum@yahoogroups.com]On Behalf Of John
> Sent: Wednesday, October 11, 2006 6:44 PM
> To: WanderlodgeForum@yahoogroups.com
> Subject: [WanderlodgeForum] Tire Question...12R22.5
>
> I have started looking for new tires for our coach as it has the
> origional tires on it. While they are showing no cracking at all, I am
> still concerned about their age and would like to start swapping them
> out before I have to do it from the side of the road. The current
> tires are 12R22.5 which seems to be a lot more uncommon than
> 11R22.5s(which I run on my dump truck). From talking to a couple tire
> people they say the 11R22.5 are a little smaller(shorter). Has anyone
> switched from the 12s to the 11s? Any recomendations on a particular
> brand?
>
> Thanks,
> John Cassel
> 98 Wanderlodge LX
>
>
>
> [Non-text portions of this message have been removed]
>

[dthollis1961]

Just saw an 84FC with 315s the other day in Talladega. The owner
loves them. One tire site I was looking at showed that although 9" is
the design width for the 315s, 8.25 is an "approved" width.

David Hollis 84FC35 Springfield,IL



--- In WanderlodgeForum@yahoogroups.com, "birdshill123"
wrote:
>
> The 315's will not work with the FC coaches. Mine has 8.25 inch
rims.

[birdshill123]

Although the 315's are one "mother of a tire" I can foresee some
problems. Michelin says you can use them on a 8.25 inch rim. BUT this
makes the tire 3/10ths of an inch wider for a total width of 12.8
inches. The 12R's are 11.4 wide. That is almost an inch and a half
wider. I would be concerned about the duallies rubbing. The Michelin
truck tire book also derates the tire when mounted on a 8.25 inch rim.
When used as a single it goes from 9090 per tire to 8000 at maximum
inflation. One of the biggest advantages of using this tire would have
been the ability to run lower pressures with the same load capacity.
The derating negates most of that advantage. I will stick with the
12R's.

Bruce 1988 FC35