well, a year at least...

My manuals are at home. The car is riding on the 91 formula 16x8 snowflake rims, 245/50/16 or whatever PZeroNero tires.

What's proper pressure, 30-35?





Right now 3 of 4 are at 20psi and one is at 25.

 

Good grief! For the stock 16's on my IROC, the pressure is 30 cold.

JamesC

 

Actually, it's probably more like 2 years...


When I was younger, the car used to be for fun, now it's just "the car I drive to work." I still enjoy it and have plans for it, but I really don't even think about maintenance anymore. There are so many other things in life that consume time.

Anyway, thanks for the response.

 

Most cars have a little sticker in the drivers door jam that list the cold TP.

 

30-32 would be a good point.

 

check the tire pressure specs in the door jam. that is the proper pressure. get your information from no one else

 

Thanks, but that sticker fell off years ago. I went with 30ish.

 

Use the max pressure rating on the tire, but keep it slightly below (ie:35psi max, keep it @ 32) ask any tire store and they'll tell you the same. As for using the sticker, wouldn't that only hold true if the mfgr of the tire was the same as from the fact?

 

Tire pressure is a function of the rims and not of the tire. If I remember right, I think the max pressure on my tires is 55psi. But that doesn't mean the rims can handle it.

 

I've never heard that one before (and if I did, I'd be searching for another tire outlet, I think). Shoot, with my max at 44, I'd inflate to 41 or so with the above formula--around 11 pounds more than my door placard recommends. The car would ride like a lumber wagon and tire wear would be atrocious.

JamesC

 

Say what you want, my Navigator says 26lb in front and 33lb in rear, but the factory tire size was 285/60r17, 35psi max.
I am now running 285/60r18, 44psi max. (now 31.5" tall vs. 30.5" tires)
If I only put 26psi in my tire, there would be nothing left of the outside tred on my tire in no time...
That was not a formula I gave him if you want a formula you would have to take into consideration the weight of the vehicle, tire size in relation to rim width and the list goes on. Max pressure means just that, if you look at the small writing next to the max pressure it will tell you at how many lbs/kgs of vehicle weight that pressure is needed. Pretty self explanitory if you ask me. As a general rule, keep 44psi tires around 37psi and 35psi at 32psi.
In my pickup i will inflate the rear tires to max pressure when I am towing or hauling anything that is close to capacity.
I guarentee if you look up what tires are "factory approved" they would be 35psi max tires, if your tires are wearing on the outside they are underinflated, if they are wearing on the center they are over inflated.
If you don't believe me, use a tred-wear indicator and see for yourself where the wear is on your tire.
If you want more go to tirerack.com

 

Yeah... thanks... I'll go put 50 psi of air in my tires.

 

See if they'll pop?

 

I'm running OEM style tires on OEM rims. I check air pressure and rotate with regularity. At 30 pounds, I've noticed no obvious tread-wear pattern. I've always imagined that GM determined psi with ride comfort and tire wear in mind. At any rate, I'm satisfied.

JamesC

 

WHOOPS well then ignore me, i didnt know that