Tire pressure?

[mf7365]

I just put on 4 new firestone destination a/t's on my 97 mountaineer 5.0 w/ the stock wheels 235/75/15 size. The door jamb calls for 26 psi all the way around but this has always seemed on the low side. Should I stick with it or increase the psi and if so how much?

 

[koda2000]

that seems way too low to me. i think the door sticker on my 2001 5.0L EB RWD says 32-35 psi. i run 32 psi in my 16" Michelin's. i'll check my sticker the next time i go outside, but 32 is providing me with good tire wear, decent ride and fuel economy.

 

[bill06447]

I've been running 35 in mine, though the cold inflation pressure on the sidewall of my tires states 44psi.

Since the new-to-me higher pressure tires came out, I am constantly debating the whole proper pressure thing, since tire placards on older vehicles are based on the older 32 psi tire standard

Bill

 

[drdoom]

32psi minimum for P passenger tires, possibly a good bit more if you are running LTs.

 

[DjDom]

Don't inflate it to what it says on the side of the tire. That's the absolute max pressure the tire should be inflated to.
It greatly depends on what tires you're running.
For passenger tires, I'd go somewhere from 32-35, as said above. For LT tires with an aggressive thread that you run on the street, like my Goodyear Wrangler Territories, I run 40 PSI since it's very loud on the road otherwise, and 40 PSI gives even wear.

 

[swshawaii]

Ford Motor Company is revising the recommended tire inflation pressure on your vehicle if your vehicle is equipped with Firestone P235/75 R15 tires. Bridgestone/Firestone, Inc. has requested that Ford revise the recommended tire pressure to 30 psi. For vehicles originally equipped with other tires, the recommended tire pressure remains as specified on the certification label on the driver's door.

http://www.justanswer.com/ford/0qw8e-hi-chris.html

 

[chefduane]

Max pressure on my P235/75r/15 Goodyear Radial Wranglers is 35psi. I air 'em up to about 33 every time I rotate them when I do an oil change.

 

[Flash]

Only run 26psi if you want your car to live up to the nick name of exploder.
At that pressure the tyre runs too hot and you'll get belt failure.

Goodyear tyres usually take a lower pressure and have a soft sidewall and pumping them up hard makes no difference. While this is good in some terrains like sand, I do almost all my driving on the road and I don't like soft sidewalls.

Tyre construction varies but with a 235x75 I would run at least 35 and probably 38 to 40 and keep an eye on the wear. But I like a direct control tyre.

Your results may vary.

One trick we used to use when racing was to use a laser pyrometer on different spots on the tread surface to determine stresses on the tyres.
We'd end up with different tyre pressures everywhere but that was racetrack conditions.

 

[mf7365]

I've been running 34 psi since I got the tires. The 26 on the door just seemed ridiculous unless I was driving in sand or something extreme off-road.

 

[SoNic67]

Ford raised the pressure to 30psi, your door jamb sticker was recalled a long time ago (2000).
Don't use any other pressure, using maximum inflate pressure listed on the tire sidewall is extremely dangerous (beside being useless).
Below is my 2001 sticker: