Ok We know that Chevrolet specifies 30 psi (cold), but that is for Goodyear EMT's. What do they specify for Firestone?. After all Firestone runflats have an entirely different design and structure. Hmmm ..or should it matter??? Any comments?

 

Hi JCR,
Well.....I run 25 rear and 34 front cold.

The wear pattern is great..rears even all the way across. The fronts still meat in the center outside edges wearing thin..but that is from my cornering style.

As a guide, the tire pressure should be set so the tire heats up to its optimum heat range. Conform, wear are side items.

A 10% rise in pressure from cold to hot gets you in the ball park.

So if I wanted to suggest to you I would say try 28 rear and 32 up front and see what you think.

So....if you set the tires to 30 and they raise to 33 hot you are OK. You can also experiment to find what pressures work for your driving feeling/ style.

If set at 36 cold and they raised to 40...you are in the ball park. etc.

For me, I drive with my butt. I like an even 4 wheel slide. To explain I feel the car move from my bottom and in the base cushion of the seat (ie; Not my back, not my shoulders..if you know what I am trying to write). With 34 up front I get a lighter steering feel and the center of the tire never wears out. So that pressure works for me.

In the rear, I like to power slide and I do accerate when ever possible so the rears heat up a little more than the fronts which raise the center tread. With 25 the center does not expand so much and I get even tread wear all the way accoss.

Lastly, my tire life is 20K miles.

 

I run 30 psi all around in the winter and 28 in the summer. Where I'm at it doesn't get very cold in winter, but in summer they can go up 3-4 degrees and I'd like to keep them under 32 lbs when hot. I've had good wear on mine, with the GY fronts going 32K miles and the GY rears went 18K before finding a nail, but I would guess that they had another 8k left on them. I have 16K on the FS runflats on the rear and they are still looking good.


[Modified by FunDriver, 11:24 PM 1/12/2003]

 

I use 32 lbs. in all tires; feels good; handles good; and shows no wear so far. :)

 

As a rule of thumb, the tire pressure for a car is not related to the brand of tire. 30 lbs. is 30lbs.

Start with that, then "tune" it up or down as you like it.

Different brands of tires do have somewhat different maximum pressures, but that has nothing to do with the car.

 

Doesn't matter. You want them to be 34 PSI when hot. To reach this just drive at highway speeds for 10-20 minutes at about 2 p.m. and then use a physical gauge to check the pressures. Ignore your DIC, it's probably not accurate enough. If you do this your tires will be 30 PSI cold during the day and about 28.5 PSI cold at about 4 a.m.

 

I ran 32 pounds in my Stones, and got 48,000 miles on them before I replaced them with another set of "stones." Goodyears got noisy and slippery @ 15,000 miles.

Unfortunately my new 2003 A-4 forces me back on Goodyears.

Tom Kearns
Lenexa KS

 

i run (hot) 35 front 32 rear...i'm at about 30k miles with these and about 5k left on the rears. love the stones!

 

I run 30 lbs all the way round all the time. Set the pressures when the tires are cold. Hot pressures are an unknown quantity on any tire unless you have a lot of data documenting the tire's performance. On the street its worse since even if you do know the actual temperature you still do not know what the best operating temp range for the tire really is.
Bill