PT 40, 42 & 43 owners. A ? about your tire size

[Kurt Horvath]

After a 2 hour web search I can not find anybody that makes a tire in
315 75R 22.5.
Everybody has a 315 80R 22.5 they are about 1" wider than a 12R 22.5
& 11.3" Vs 12.5" in width, and the 315's are a little shorter,19.6"
Vs 19.8" loaded radius, overall diameter is the same @ 42.4", they
both use 9" rims, the 315's have a 1700lbs single wheel higher
capacity and a 1465lbs higher dual wheel capacity, per tire.
The only thing I see as a problem may be the dual wheel spacing.
13.2" for the 12R and 14.1" for the 315's. The only other difference
is revolutions per mile, I'd say insignificant @ 2 RP Mile. Info from
B.F.Goodrich. The only chart I could find without bouncing all over
the web
I've seen several size tires on comparable birds PT 40,42,& 43's,
I've seen coaches with 11R 22.5, and the coach for sale on e-bay
states it has 315's on it..
Convention wisdom states all tires should be of the same size & Mfg.
I would like to have the heavier tires on the steer axles. I don't
think 1/2 inch wider on each side of the tire in the front wheel
wells would make a difference, though it is already a tight fit., and
I'm not sure if the larger tires would have an adverse effect on the
overall drive ability. I'm hoping for better control , higher
capacity and the added safety in a more capable tire.
Any thoughts?

Kurt Horvath
95 PT-42
10AC

[mrkane1952]

Are your wheels rated for the higher pressures and weight loading of
the LRJ and LRL tires? My 8.25x22.5 wheels are only rated to 120 psi
and 7000 lbs.

I opted for 295/80R22.5 G670RVs recently when I couldn't find 12Rs
from an acceptable manufacturer.

M.R.Kane
1987 PT40
1985 PT40 for sale
currently Clarkston, WA

[Ross]

Hi
Prevost runs 365x 70 on the front and tag with 315x 80 on the drives

Ross
> Convention wisdom states all tires should be of the same size & Mfg.
>

[Gregory OConnor]

Kurt, proverbialy you always try and reinvent the wheel, now you
crossed the line. Stay with 12's.

steer tires on many commercial rigs are different than drive tires
(tag and power axle). I stick with the 12R's because the actual size
seem closer MFG to MFG and they are easier to find than metric (I
think Sears started metric just to sell 2 sets and an extra
drawer).

If you set up a rotation purchase of tires you can always have new
tires on the steer. I like to drop new upfront because I think slow
turning and stationary turning on hot asphalt can cause ply
adhersion/seperation issues. Regroovable tires always seem to be
built for the market that puts the tires to the test so I try and
find regroovables (but have never had them grooved). I always
feared that the comfort ride claims of Mitch' tire design have
compramised the build but that may just be a way for me to justify
not paying the extra 100 per the tire Mitch charge.

If you want my opinion, you have 8 good tires now. I would not add
more than 2 per the year. new upfront, the old front to one side of
the drive axle or the other side or split them up on the tags. This
would leave you with only the choice for 12's. no need to rotate the
tires around the back and height is not an issue from side to side
because the differential knows not to spin both sides the same.
Some think tire size overworks the diff ans screws with the ring
gear, I think it is worked by bad shocks or uneven roads. --- In
WanderlodgeForum@yahoogroups.com, "Kurt Horvath"
wrote:
>
> After a 2 hour web search I can not find anybody that makes a tire
in
> 315 75R 22.5.
> Everybody has a 315 80R 22.5 they are about 1" wider than a 12R
22.5
> & 11.3" Vs 12.5" in width, and the 315's are a little
shorter,19.6"
> Vs 19.8" loaded radius, overall diameter is the same @ 42.4", they
> both use 9" rims, the 315's have a 1700lbs single wheel higher
> capacity and a 1465lbs higher dual wheel capacity, per tire.
> The only thing I see as a problem may be the dual wheel spacing.
> 13.2" for the 12R and 14.1" for the 315's. The only other
difference
> is revolutions per mile, I'd say insignificant @ 2 RP Mile. Info
from
> B.F.Goodrich. The only chart I could find without bouncing all
over
> the web
> I've seen several size tires on comparable birds PT 40,42,& 43's,
> I've seen coaches with 11R 22.5, and the coach for sale on e-bay
> states it has 315's on it..
> Convention wisdom states all tires should be of the same size &
Mfg.
> I would like to have the heavier tires on the steer axles. I don't
> think 1/2 inch wider on each side of the tire in the front wheel
> wells would make a difference, though it is already a tight fit.,
and
> I'm not sure if the larger tires would have an adverse effect on
the
> overall drive ability. I'm hoping for better control , higher
> capacity and the added safety in a more capable tire.
> Any thoughts?
>
> Kurt Horvath
> 95 PT-42
> 10AC
>

[Stephen Birtles]

Kurt is not reinventing the wheel Just trying to find the proper size


Stephen 77fc35



--- In WanderlodgeForum@yahoogroups.com, "Gregory OConnor"
wrote:
>
> Kurt, proverbialy you always try and reinvent the wheel, now you
> crossed the line. Stay with 12's.
>
> steer tires on many commercial rigs are different than drive tires
> (tag and power axle). I stick with the 12R's because the actual size
> seem closer MFG to MFG and they are easier to find than metric (I
> think Sears started metric just to sell 2 sets and an extra
> drawer).
>
> If you set up a rotation purchase of tires you can always have new
> tires on the steer. I like to drop new upfront because I think slow
> turning and stationary turning on hot asphalt can cause ply
> adhersion/seperation issues. Regroovable tires always seem to be
> built for the market that puts the tires to the test so I try and
> find regroovables (but have never had them grooved). I always
> feared that the comfort ride claims of Mitch' tire design have
> compramised the build but that may just be a way for me to justify
> not paying the extra 100 per the tire Mitch charge.
>
> If you want my opinion, you have 8 good tires now. I would not add
> more than 2 per the year. new upfront, the old front to one side of
> the drive axle or the other side or split them up on the tags. This
> would leave you with only the choice for 12's. no need to rotate the
> tires around the back and height is not an issue from side to side
> because the differential knows not to spin both sides the same.
> Some think tire size overworks the diff ans screws with the ring
> gear, I think it is worked by bad shocks or uneven roads. --- In
> WanderlodgeForum@yahoogroups.com, "Kurt Horvath"
> wrote:
> >
> > After a 2 hour web search I can not find anybody that makes a tire
> in
> > 315 75R 22.5.
> > Everybody has a 315 80R 22.5 they are about 1" wider than a 12R
> 22.5
> > & 11.3" Vs 12.5" in width, and the 315's are a little
> shorter,19.6"
> > Vs 19.8" loaded radius, overall diameter is the same @ 42.4", they
> > both use 9" rims, the 315's have a 1700lbs single wheel higher
> > capacity and a 1465lbs higher dual wheel capacity, per tire.
> > The only thing I see as a problem may be the dual wheel spacing.
> > 13.2" for the 12R and 14.1" for the 315's. The only other
> difference
> > is revolutions per mile, I'd say insignificant @ 2 RP Mile. Info
> from
> > B.F.Goodrich. The only chart I could find without bouncing all
> over
> > the web
> > I've seen several size tires on comparable birds PT 40,42,& 43's,
> > I've seen coaches with 11R 22.5, and the coach for sale on e-bay
> > states it has 315's on it..
> > Convention wisdom states all tires should be of the same size &
> Mfg.
> > I would like to have the heavier tires on the steer axles. I don't
> > think 1/2 inch wider on each side of the tire in the front wheel
> > wells would make a difference, though it is already a tight fit.,
> and
> > I'm not sure if the larger tires would have an adverse effect on
> the
> > overall drive ability. I'm hoping for better control , higher
> > capacity and the added safety in a more capable tire.
> > Any thoughts?
> >
> > Kurt Horvath
> > 95 PT-42
> > 10AC
> >
>

[Kurt Horvath]

OH Gregg !, I'm just trying to make what I've got better, Ya know be
all that you can be and all that trash.

I'll talk with my tire shop about rotational purchasing sounds like a
winner.

Anyway after a little more research I found that any advantage is
lost with a 8.25 inch rim, which is the size on my coach. The
capacities are reduced to MOL the same specs.

I wish all my tires were good. I put two new steers on it last year
and within 1000 mile hit a coral rock leaving an RV park in the Fla.
Keys and put a nice slice in the side wall. That didn't bother me
much until I measured the depth of the cut, over .250 thousandths,
That's a ¼ " :{ I've been running on it, but now it's starting to
bother me.

The other issue is availability. 12R22.5's are or were hard to find,
last Oct. I had a side wall blowout in Texas. The dealers could only
find 2 Michelin XZE* in 12R22.5 in the country, they were in
Sacramento. Now I've got an over priced Goodyear G149 RSA on the
coach. Ticked me off I just had all the tires matched up and running
good.

So you are right gonna stick with the 12's, get two new steers and
put the one good steer in place of my oldest tire. I guess I might
throw the cut tire in the trailer for a spare. It would get me home
and I wouldn't be held hostage to buy whatever is available on the
side of the road.

I've got a great picture of Cavemen beating on a square rock trying
to turn it into a wheel, need to send to you LOL :}

Kurt Horvath
95 PT-42
10AC


--- In WanderlodgeForum@yahoogroups.com, "Gregory OConnor"
wrote:
>
> Kurt, proverbialy you always try and reinvent the wheel, now you
> crossed the line. Stay with 12's.
>
> steer tires on many commercial rigs are different than drive tires
> (tag and power axle). I stick with the 12R's because the actual
size
> seem closer MFG to MFG and they are easier to find than metric (I
> think Sears started metric just to sell 2 sets and an extra
> drawer).
>
> If you set up a rotation purchase of tires you can always have new
> tires on the steer. I like to drop new upfront because I think slow
> turning and stationary turning on hot asphalt can cause ply
> adhersion/seperation issues. Regroovable tires always seem to be
> built for the market that puts the tires to the test so I try and
> find regroovables (but have never had them grooved). I always
> feared that the comfort ride claims of Mitch' tire design have
> compramised the build but that may just be a way for me to justify
> not paying the extra 100 per the tire Mitch charge.
>
> If you want my opinion, you have 8 good tires now. I would not add
> more than 2 per the year. new upfront, the old front to one side of
> the drive axle or the other side or split them up on the tags. This
> would leave you with only the choice for 12's. no need to rotate
the
> tires around the back and height is not an issue from side to side
> because the differential knows not to spin both sides the same.
> Some think tire size overworks the diff ans screws with the ring
> gear, I think it is worked by bad shocks or uneven roads. --- In
> WanderlodgeForum@yahoogroups.com, "Kurt Horvath"
> wrote:
> >
> > After a 2 hour web search I can not find anybody that makes a
tire
> in
> > 315 75R 22.5.
> > Everybody has a 315 80R 22.5 they are about 1" wider than a 12R
> 22.5
> > & 11.3" Vs 12.5" in width, and the 315's are a little
> shorter,19.6"
> > Vs 19.8" loaded radius, overall diameter is the same @ 42.4",
they
> > both use 9" rims, the 315's have a 1700lbs single wheel higher
> > capacity and a 1465lbs higher dual wheel capacity, per tire.
> > The only thing I see as a problem may be the dual wheel spacing.
> > 13.2" for the 12R and 14.1" for the 315's. The only other
> difference
> > is revolutions per mile, I'd say insignificant @ 2 RP Mile. Info
> from
> > B.F.Goodrich. The only chart I could find without bouncing all
> over
> > the web
> > I've seen several size tires on comparable birds PT 40,42,&
43's,
> > I've seen coaches with 11R 22.5, and the coach for sale on e-bay
> > states it has 315's on it..
> > Convention wisdom states all tires should be of the same size &
> Mfg.
> > I would like to have the heavier tires on the steer axles. I
don't
> > think 1/2 inch wider on each side of the tire in the front wheel
> > wells would make a difference, though it is already a tight fit.,
> and
> > I'm not sure if the larger tires would have an adverse effect on
> the
> > overall drive ability. I'm hoping for better control , higher
> > capacity and the added safety in a more capable tire.
> > Any thoughts?
> >
> > Kurt Horvath
> > 95 PT-42
> > 10AC
> >
>

[Gregory OConnor]

"Proper size" sound too adequate for a perfectionist . his attention
to detail is a great asset to the forum.

Greg
--- In WanderlodgeForum@yahoogroups.com, "Stephen Birtles"
wrote:
>
>
>
>
> Kurt is not reinventing the wheel Just trying to find the proper size
>
>
> Stephen 77fc35
>
>
>
> --- In WanderlodgeForum@yahoogroups.com, "Gregory OConnor"
> Gregoryoc@ wrote:
> >
> > Kurt, proverbialy you always try and reinvent the wheel, now you
> > crossed the line. Stay with 12's.