Not Much Luck Buying Tires for our WL in San Antonio, TX :(

[mbrund]

Woops, should have said that Firestones 315/80R22.5 can be mounted
on 8.25" depending on their load range. Michelin does not specify
load range, just that they can be mounted on 8.25" rims (or at least
the old brocheure for the XZA's I have states that).

Firestone states that if you have a 315/80R22.5 load range L (20
ply - max speed 55 MPH) it must be mounted on a 9" rim.

I used the FS400 315/80R22.5 rated for max speed 75MPH which are the
18 ply load range J, which can be mounted on 8.25" rims. But I
believe the real issue is still rim offset, which I have not been
able to find info on.

So when the tag and drive axles air bags are aired up things are OK,
when the tag air bag is dumped the drive tires touch.

Michael Brundridge
1992 WB40
Georgetown, TX

--- In WanderlodgeForum@yahoogroups.com, "mbrund" <mbrund@...> wrote:
>
> Actually. both the Michelins and Firestones state you can use
315's on
> 8.5" rims. The issue really is, does the rim have enough offset
to
> allow the correct tire spacing between duals.
>
> And I can say that the ones that came on my coach do not as they
are
> too close for my comfort. But the coach ran on 315's for ten
years
> before I got it, with 15K a year avg and never had a tire
failure.
> The tires do not touch when axles are aired up, just really
close.
> They do touch when the tag is down.
>
> The big concern is, since the spacing is so close, it is possible
to
> pickup a small stone and take out both tires.
>
> Michael Brundridge
> 1992 WB40
> Georgetown, TX
>
> --- In WanderlodgeForum@yahoogroups.com, Larry
> wrote:
> >
> > Rob,
> > When researching, (another thought came to mind) the specs for
the
> 315 was you needed a 9" rim, that is why I did not look into them
at
> the time... Did you change over to 9" rims, or were they already
on
> the coach???
> >
> > Sea Ya
> > Larry
> > NYC
> > 84 35FCSB
> >
>