Tire Pressure

Go with the Ford recommendation (whatever's on the door post.)
    SC Tom

ARE you SURE the Ford listing is MAX tire pressure?
There's a big difference.

The Tire listing means exactly that.  The tiremaker knows the design limits
of the tire.. but he has no idea for certain what vehicle it might be used
on.

The Car Mfr recommends the best pressure for load, economy/wear and
handling.  And has NO way of knowing what aftermarket tire MAX might be.

HOWEVER - as you may know, different tire designs may handle differently
and work/ride/wear better at slightly higher or lower pressure so it should
be used as a general guide.

Hmmm... just happened to think..maybe that's why tires have a speed
rating code instead of actually just LISTING the speed limitations, eg
130MPH..
;)

What?  Where the hell does Ford recommend 30psi? Go with what the tires say,
44psi, or, of course, you can always just blow a tire and die if you like.

Brad

Ford designed the automobile, therefore they know what pressure is required
(they depend on quality tires, unlike the Firestones a few years ago).
The max pressure listed on the tire is just that - the maximum psi that can
safely be used.  The tire manufacturer does not care about the handling or
ride comfort.  Go with the Ford recommendation.

What? ARe you saying to run a 44psi tire on 30psi?  BLOWOUT ahead! Like I
asked, WHERE has Ford said A taurus must run 30psi? Maybe on the stock
tires... are these stock? I doubt it.

Sorry man.

Brad

This is a terrible recommendation. Assuming the new tires are of the same
size and load rating as were supplied on the car, you should follow the
vehicle manufacturer's recommendation. Michelin has the following to say
(see http://www.Michelin.com/care/tip1.html  ):

"Recommended Pressure

"Always inflate your tires to the recommended pressure listed by your
vehicle's manufacturer. This information can be found in the owner's manual
and often on a placard located in the vehicle's door jamb, inside the fuel
hatch, or on the glove compartment door."

This is a recommendation for US drivers. P Series tires with a 44 psi
recommendation are not rated to carry a higher load than other P series
tires of the same size with the same load rating which may only have a 35
psi  maximum pressure rating . The higher maximum pressure is to allow
vehicle manufacturers to recommend higher pressures for higher speeds. The
spec sheet for Harmony tires includes the following additional
recommendation (http://www.michelinman.com/assets/pdfs/doc_harmony.pdf ):

"For high-speed driving, additional inflation pressure and possibly reduced
tire loading and/or upsizing is required. In the absence of specific
recommendations by the vehicle manufacturer, use the following guidelines
based on those in the European Tyre and Rim Technical Organization Standards
Manual.

For speeds over 160 km/h (100 mph), load and inflation must be adjusted
according to the table below.
S-Speed Rated Sizes:
Maximum Speed (mph)       100 106 112
Inflation Increase (psi)          0.0  1.0  2.0
Load Capacity (% of max.) 100 100 100
T-Speed Rated Sizes:
Maximum Speed (mph)       100 106 112 118
Inflation Increase (psi)          0.0 1.0   2.0  3.0
Load Capacity (% of max.) 100 100 100 100

Of course, since US speed limits are much less than 100 mph, these
recommendation in theory only apply to certain European countries (Germany).

Regards,

Ed White

So, you are saying Ford put a 44psi tire on a car that they recommend run
30psi?  (Does this car have a 60mph limiter on it?)

Are you guys crazy? Do you know what happens to severely underinflated tires
at highway speed. Try it for a while. PS: wear your seatbelt, you're going
to need it.

Again, would someone show me WHERE does Ford say to put 30psi in a 44psi
tire? Please, explain. The original poster has no idea what he is talking
about, and neither do you guys. No offence.

Brad

 
Re: Tire Pressure  
 
Group: alt.autos.ford Date: Fri, Sep 30, 2005, 6:22am (EDT+4) From:
BradandBrooks@shaw.ca (BradandBrooks)
What? Where the hell does Ford recommend 30psi? Go with what the tires
say, 44psi, or, of course, you can always just blow a tire and die if
you like.
This is a terrible recommendation. Assuming the new tires are of the
same size and load rating as were supplied on the car, you should follow
the vehicle manufacturer's recommendation. Michelin has the following to
say (see http://www.Michelin.com/care/tip1.html  ):
So, you are saying Ford put a 44psi tire on a car that they recommend
run 30psi? (Does this car have a 60mph limiter on it?)
Are you guys crazy? Do you know what happens to severely underinflated
tires at highway speed. Try it for a while. PS: wear your seatbelt,
you're going to need it.



Again, would someone show me WHERE does Ford say to put 30psi in a 44psi
tire? Please, explain. The original poster has no idea what he is
talking about, and neither do you guys. No offence.
Brad<<<<<<<<<<<<<<<<<<<<<<<

Go look at a new car on a dealers lot. Check the tire sidewall for
_maximum pressure_ info then check the doorjam sticker for the
recomended tire inflation. I have "H" series tires on my car and it says
"max pressure 44 psi", the sticker says 32psi normal cold inflation.

Running at 40-42 psi will be like riding on steel wheels and the over
inflation will play havoc with the tread wear same as under inflated.


Eric  

There's a sticker on the inside of the fuel hatch that plainly details the
size of tire to be used on the vehicle and the max PSI.



Uh, apparently you're the one in the dark and spouting bullshit.  No
offense.

Sorry, but you don't understand tires or the tire industry. There are
standards for a given size and type of tire. The pressure on the sidewall is
the maximum inflation pressure for the tire, but not necessarily the correct
inflatin pressure for any given application. There are industry standard
load vs inflation pressure tables for any given type (p series, lt, etc.),
size (P195/70R15, P335/65R16, etc.), and load rating (98, 105, etc.).


Sorry, but you are the one who is wrong.  Your basic mistake is thinking
that it is a "44 psi" tire. The 44 psi pressure is not the correct inflation
pressure, it is the maximum inflation pressure. Ford doesn't recommend
buying a 44 psi tire or a 35 psi tire. They recommended a certain size and
load rating for the tires and a pressure appropriate for tires of that size
and load rating. For a 2004 Taurus, the standard tire was a P215/60R16 94T.
The P215/60R is the tire size. the "94" is the load rating. The "T" is the
speed rating. The Ford pressure recommendation is appropriate for any P
series tires of the correct size (215/60R16) and load rating (94 = 1477 lb).
The Harmony tire in the OP happens to have a maximum pressure rating of 44
psi. The maximum load rating for this tire is 1477 lb (and it actually can
support this weight with only 35 psi, the 44 psi maximum is to allow higher
pressure recommendations for substained high speed operation). A 2004 Taurus
has a curb weight of around 3400 lb and a maximumloaded weight of less than
4000 lbs, or less than 1000 lb per tire. I don't don't have a copy of the
load inflation table fore this tire size with me today, but I am sure that
the tries are rated to carry far more than 1000 lb each when inflated to 30
psi. One thing I did notice - the Haromony tires in the P215/60R16 size are
only "S" rated tires (112 mph). The OE tires were T rated (118 mph).

Please study the situation before giving out more bad advice. Start
educating yourself by reading the following references (I have copied
information from the major US tire manufacturers):

http://tires.michelin-us.com/care/tip1.html

"Recommended Pressure
"Always inflate your tires to the recommended pressure listed by your
vehicle's manufacturer. This information can be found in the owner's manual
and often on a placard located in the vehicle's door jamb, inside the fuel
hatch, or on the glove compartment door."

http://www.conti-online.com/generator/www/us/en/continental/automobile/general/safety/part_rma_en.html

"Use the correct inflation pressure recommended by the vehicle manufacturer,
not the pressure listed on the tire sidewall....."
"....More than half of drivers -- 55 percent -- incorrectly believe that the
correct inflation pressure is printed on the tire sidewall." - clearly they
added this line for people like you!

http://www.goodyeartires.com/faqs/Inflation.html#1

"How much air should I put in my tires?

"Proper inflation is the single most important part of tire care. The
inflation pressure on the side of the tire is the MAXIMUM operating
pressure. It is not necessarily the right inflation for your vehicle. Always
use the inflation recommended by the vehicle manufacturer. You can find it
in your owner's manual, posted on the edge of the driver's door, on a door
post or on the inside of the glovebox door."

http://www.tiresafety.com/maint/maint_ipressure.asp  - this is Firestones /
Bridgestones site:

"Vehicle manufacturers list recommended tire pressures for original vehicle
tires in the owner's manual or on a placard on the end of the driver's side
door or in the glove box."

      http://www.coopertires.com/us/en/safety/TireSafety2.asp

      "The Proper Pressure
      ......

      "There is no universal "right" pressure for all tires. The proper
inflation level will depend on what tires you have, and it may even be
different for your front and back tires. To find the correct pressure for
your tires, look at the tire information placard that's mounted inside the
frame of the driver's door, in the glove box or inside the fuel door. You
can also get that information in your vehicle owner's manual and from your
tire dealer."


http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35

Ed

"Arielo" wrote:
 > >I just put a new set of Michelin Harmonies on my 2004 Taurus.
 > >
 > > The tires have a max PSI of 44 listed on the sidewall.
 > > Ford recommends a max PSI of 30 for tires on this car.
 > >
 > > How much pressure should I use in practice?  Car typically
 > doesn't haul
 > > any heavy loads.
 > > TIA
 > >
 >
 > What?  Where the hell does Ford recommend 30psi? Go with what
 > the tires say,
 > 44psi, or, of course, you can always just blow a tire and die
 > if you like.
 >
 > Brad

tires get hot and pressure raises. you dont want to put 44psi in a
cold tire then drive it and have the pressure raise to 55psi. on the
door it will say what is recomended, use that. then you can play with
it alittle to get the comfort you want (+-3-5psi)

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For tires pressures are "When Cold", so what the pressure rises to when hot
is not really part of the equation.

FYI:
My 2005 F-450's tires are filled to 95 PSI as per both the tire sidewall and
the Ford door plate.

What's an F-450?

 
Re: Re: Tire Pressure  
 
Group: alt.autos.ford Date: Thu, Sep 29, 2005, 8:01pm From:
mkr@charter.invalid (Michael)
"xmirage2kx"  

FYI:
My 2005 F-450's tires are filled to 95 PSI as per both the tire sidewall
and the Ford door plate.



What's an F-450? <<<<<<<<<<<<<<<<

A big Ford truck. Bigger than the F150-250-350.

Eric

The cabs inside and out and front end sheet metal and grill on and the
engines and transmissions in the F-450 and F-550 are the same as the
F-250/F-350.  The only differences are with the massively larger frame,
springs, brakes, wheels/tires & axels, equaling much higher weight carry and
towing weight limits, in a truck that is essentially the same size as its
lighter duty Superduty siblings.

Now the F-650/F-750, now those are a much Bigger Ford truck than the
F150-250-350-450-550.

The cabs inside and out and front end sheet metal and grill on and the
engines and transmissions in the F-450 and F-550 are the same as the
F-250/F-350.  The only differences are with the massively larger frame,
springs, brakes, wheels/tires & axels, equaling much higher weight carry and
towing weight limits, in a truck that is essentially the same size as its
lighter duty Superduty siblings.

Now the F-650/F-750, now those are a much Bigger Ford truck than the
F150-250-350-450-550.

 
Re: Re: Tire Pressure  
 
Group: alt.autos.ford Date: Sat, Oct 1, 2005, 6:15am (EDT+4) From:
351CJ@msn.com (351CJ)


A big Ford truck. Bigger than the F150-250-350.
Eric

Eric,
The cabs inside and out and front end sheet metal and grill on and the
engines and transmissions in the F-450 and F-550 are the same as the
F-250/F-350. The only differences are with the massively larger frame,
springs, brakes, wheels/tires & axels, equaling much higher weight carry
and towing weight limits, in a truck that is essentially the same size
as its lighter duty Superduty siblings.
Now the F-650/F-750, now those are a much Bigger Ford truck than the
F150-250-350-450-550. <<<<<<<<<<<<<<

I just gave him a simlple answer. Yours is much more than I needed to
know ;-)))

Eric

Well frankly your answer was not in fact simpler, it was simply
inaccurate...
Since you were attempting to answer someone's question, seems you did indeed
need to know...