The Firestone tires were likely P235/75's and the Duellers are LT235/75. The P
stands for passenger and LT light truck. The LT tires will have more plys and a
general heavier construction (and won't ride as nice as the Ps) that allows for
a higher load rating. The max pressure rating on the side of the tire is the
pressure necessary for the tire to safely support the maximum load capcity
marked on the side of the tire.
The sticker on your drivers door is the pressure the manufacturer has
determined to be the best all around compromise (economy, load capacity, ride
comfort and wear) for the vehicle with tires of the same size and rating as
originally provided.
Running the max pressure on the side of the tire on a pickup that is seldom
loaded to it's capacity will provide for some improved economy at the expense
of a harsher ride and accelerated tire wear (in the center of the tread) and
decreased handling (due to the unloaded bed allowing for the back end to skip
around during cornering).
If you do not drive off road and don't load your truck to it's capacity stick
with P series tires with a street tread. They weight less and roller better
than a LT tire with an off road or all terrain tread.
Dave Clement
99 SLT+ CC 4x4
In article <42C2AB84.7030603@4wheelair.com>, tombuban@4wheelair.com (TomBuban)
writes:
>
>
> You just follow what is one the tires side wall. All tires are different.
>
> Zachary Burcham wrote:
>
> >
> >
> >> The max tire pressure is just that - the maximum the tire is rated to
> >> run at safely. You normally won't get up this high unless you're
> >> hauling a hefty load. Recommended operating tire pressures are well
> >> below the tire's max and are included in a little booklet that comes
> >> with the truck's manual.
> >>
> >> - - --
> >> - - -andy
> >>
> >
> > I had a real question about this comment at the end of the above
> > paragraph. Do you really use the vehicle manufactured specs on tire
> > pressure if you are running anything but OEM tires? Point being I'm
> > currently running 235/75 Dueller A/T Revos on my 92 CC 2WD. These
> > tires have a max PSI of 45, I run them at 42 normally. My last tires
> > had a max pressure of 35 PSI (Firestone Wilderness A/Ts, same size)
> > and I don't even remember what the pressure was on the tires that came
> > on the truck when I got it in 1999. But I just see that with so many
> > variances in tires that the booklet that came out in 1992 for my
> > truck, wouldn't be able to accurately cover these situations and would
> > really fall short if I was running a low profile tire, which can hit
> > 60 PSI on the max end. Anyone's input on this would be great, it's
> > just stumped me for a bit as I follow the tire's specs, but hear it
> > both ways.
> >
> > Zachary Burcham
> >
> >
> >
> >
>
This archive was generated by hypermail 2b29 : Fri Jul 01 2005 - 09:48:06 EDT