I just purchased a set of Bridgestone Dueler A/T Revo's for my 2004 4Runner
to replace the OEM Bridgestone Dueler H/T's. The recommended tire pressure
on the nameplate on the door of the vehicle is 32 psi. The max. cold
inflation pressure of the OEM tires was 35 psi, however, for the Revo's it
is 44 psi. I had read a Consumer Reports article which advised to stick with
the car manufacturer's recommendations for tire pressure, regardless of the
tire. I am not sure what the optimum pressure should be and I don't want to
damage my vehicle's suspension or effect its load rating. Any advice would
be appreciated.

Thanks,
Steve

I understand your question, but I don't understand why you would disregard
the oem recommended pressure.

If there is stated spec of torque on a bolt, would you use the max torque
rated on the wrench, or the oem torque spec?



"Steve Carr" <carrst (AT) verizon (DOT) net> wrote

"Steve Carr" <carrst (AT) verizon (DOT) net> wrote

Do a little research on the Firestone/Explorer debacle.

Personally, I look at it this way... the folks that designed the vehicle
doesn't have a clue what tires are going to be on it, or their recommended
pressures which could range from 30 to 80PSI.
I *ALWAYS* run the pressure that is on the side of the tire....max load at
XX psi. In the case of the Dueler APTs that are on my Tundra, they say
44psi...so thats where I run them. It makes for better handling, better fuel
economy, and more even tire wear.

Its your money, you can *DO* whatever you want.

"Steve Carr" <carrst (AT) verizon (DOT) net> wrote


Within reason, higher pressures won't damage your suspension. Begin by using
Toyota's recommendation. Change the pressure if:

1) You have handling problems with the tires (hydroplaning, bad traction in
snow). Raise pressure 2 lbs and judge the results. Don't go beyond 38-ish.
If these issues continue, you have the wrong tires.

2) Uneven tire wear. Ask your mechanic if this happens. It's NOT always due
to alignment problems.

"JoeSpareBedroom" <dishborealis (AT) yahoo (DOT) com> wrote

Tire pressure will not damage the suspension, hill jumping in San Francisco
will, crashing through the bushes with excessive speed isn't a real good
thing either.
Like I said before, the auto manufacturers don't have a clue what brand,
size, or type of tire is going to be on the vehicle. The tire manufacturers
design the tires for a specific purpose, with specific pressures, and load
ratings.

Don't go beyond "38ish" even if the tires are rated at 80psi?? Wrong tires??
on a truck?? Take a close look at LT type tires... 80psi, as opposed to the
passenger car tires at 32 - 44psi that most light trucks come off the
showroom floor with?? WTF??? Off road tires and monster mudders run
different pressures too, and so do racing tires.

Maybe your blanket tire pressure statement needs to be ammended??

Uneven tire wear could be caused by a dozen different problems.... shocks,
tie rods, steering, ball joints, CV joints, bushings, bearings, oh and
running the wrong tire pressures...or any combination of the above.

"Noon-Air" <Noon-Air (AT) comcast (DOT) net> wrote



You are absolutely right. But, based on the messages in this, and similar
newsgroups, people who ask questions here don't have a real mechanic. They
have a service writer (aka "fiction writer"), or a criminal. So, in your
list of things that could affect tire wear, it's a matter of luck if people
here get the right thing fixed.

I have actualy inflated the tires to the OEM recommended pressure and have
been using them that way, just to be safe until I determine the optimum
pressure, but have been reading conflicting articles, some of which say to
stick with the OEM recommendations and others which say to inflate to a
higher pressure, and some which say to inflae to the max. pressure. I am
just trying to get clarification.

My concerns are:
1) I want to be sure I am not under-inflating my new tires, thereby causing
premature wear, and
2) The max. load on both the OEM and new tires is 2337 lbs. at the max.
rated pressure. Since the OEM tires had a max. rated pressure of 35 psi, the
recommended pressure of 32 psi was 91% of max. rated. The new tires have a
max. rated pressure of 44 psi so by adhering to the recomended tire presure
of 32 psi I am only at 73% of the max. That being the case, how will the
'actual' load capacity of the new tires be effected and will they be safe at
32 psi ?
Thanks,
Steve

"Luba Papageorgio" <none (AT) none (DOT) com> wrote

I once got information directly from Michelin, and it differed by 2-3 pounds
from what Toyota recommended. Call the tire manufacturer directly. Nobody
here can give you the information you need. We can only talk in
generalities.


"Steve Carr" <carrst (AT) verizon (DOT) net> wrote

"Steve Carr" <carrst (AT) verizon (DOT) net> didst type:

Maximum pressure ratings are for maximum load. My Tundra is roughly 5,000
lbs. unloaded with a payload capacity of 1,635 lbs. (4x4) so maximum load is
around 6,635 lbs. Divide by four (yeah, yeah, not all wheels carry an
equivalent load but this is an approximation, eh?) and you get something
just shy of 1,7000 lbs.

The Revo max specs for the 265/70SR17's I run are 2,535 lbs. @ 44 psi. so
even at the Tundra's maximum load capacity, the Revo's are only loaded at
75% of their maximum rating. I run 32/34 psi front/rear for comfy ride and
may pressure up to 40/42 psi on long highway trips for a tad better mileage.

When running loaded with gear and pulling the trailer, I'll pressure up some
too for road travel. Once the pavement ends, I'll air down to the high 20s
so I don't poke a sidewall in the rocks when getting back to the campsite.
Once back to the road, its back up to 32/34/38/42/whatever. I carry a 3.5
gallon tank @ 130 psi that will give me about +12 psi per tire to air back
up.

Run your Revos at the OEM pressure guidelines found on the driver's side
sticker with confidence and vary to taste/load with confidence.

Blah
--

"Steve Carr" <carrst (AT) verizon (DOT) net> wrote

I read some time ago that the correct pressure is the one that gives
proper contact with the pavement. I.E., too much pressure and the tire
will wear out center of the tread. (Exactly what the tires were doing
on the '99 Taco I bought last year) Too little and the tire will wear
out the outside of the tread first. If you have to run a very low
pressure to achieve the proper footprint then you need another tire
sized for the weight/size of your truck.

One of the ways mentioned to determine if you have the right pressure,
is to run your truck slowly through a wet spot in a straight line. Then
see what the footprint looks like on the other side. Putting chalk marks
across the tread is another method that has been suggested. The marks
should wear off evenly when driven in a straight line.

Here is a link with pictures showing tread wear due to improper
inflation:
http://www.motortrend.com/features/c...tire_inflation

BTW, the nameplate on my '99 Taco says 29psi for the rear and 26psi for
the front. But, it also says for 225X15 tires. The truck was sold with
10.50X15 Bridgestone Duellers on it. I am running 30psi front and 28psi
rear (no load) to obtain the proper footprint.

--
Jarhead



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