Rick Lee

I have 18" Pirelli P-zeros, 235 upfront and 285 in the back. Door jamb decal says 36/44psi front and back, respectively. Last night I had a nail removed from a relatively new rear tire. Tire guy said the tire looked shot and that 44psi was way overfilling it. Center of the tread was definitely more worn than the rest. But if anything, I had been running with the tire underfilled because of that very slow nail leak that took me a few mos. to notice and do something about. I haven't put a lot of miles on the 993 recently. Another guy at the shop later told me that 44psi was fine for that tire on my 993 and I should expect at least 8k miles out of it. I'll be overjoyed to get 7k.

Paulsha911

36/44 is the factory spec for cold tire pressure for 996 18". I haven't looked thru the 993 manuals but I guess that it's the same.

InTheAir

However, from previous threads, few of us actually use those numbers in the jamb. I think most of us are at 40'ish in the rear (HOT). About 34-36 cold

Sooner

Rick,

FWIW, I am running 34 Front & 36 Rear cold psi on the same size tires you have. This puts me at around 42F 44R after hot laps on the track & also gives a good ride/handling feel on the street.

Rick Lee

Ok, that's it! I'm taking them to 34/36 when I get home tonight....just so it can be right while it sits the garage, waiting for the snow to melt

96C4S

if its stored psi should be maxed out to avoid flat spots.

Joe S.

For some fun reading on tire pressure...
https://rennlist.com/forums/showthre...=tire+pressure

Paulsha911

OK, now I am confused after reading that thread.

Sooner

As you can tell from the many threads, it seems the tire pressure debate has been going on for years. My suggestion is to experiment a bit & see what works best for you (within a safe/reasonable pressure range). All depends on personal preference & how you use the car. Or just ask someone whose opinions you trust & respect & go w/ that.

Just my 2 cents.

Joe S.

Here's what I got out of it, 35 rear, 32 front.

cabrio993

That's exactly what I use on mine after trying many different front/rear settings.

kkim

Same here.

DJF1

Like many here said, what the door sticker says , its the recommended pressure. What is commonly accepted here is that the rear 44 psi is overkill.
I normally run 34 front and 36 rear COLD on the street tires in the summer and 36 front ,38 rear COLD in the winter. While on the track I go down to 25psi cold on my MPSC's, I would not go lower than the pressures I posted above for the street , simply because there is not any chance that I'm going to put any meaningful heat on them. I have found that anywhere from 36-39 PSI HOT on the track on street tires its kind of the sweet spot in handling, so with that is mind my pressures above. Finally one has to think about potholes, too low and you may bust a tire...

Pete Lech

You are running GT3 size tires. AFAIK, the factory recommended pressures for a GT3 with PS2s is 32F & 39 R on wider wheels than stock 993.