dak911

If you are using your 996 for "just cruising" and want a soft ride...what pressures are you using?

JTT

Wear patterns on my last three sets of rear tires indicates to me that the Porsche recommended 44 psi is too high. I'm going below 40 on this next set.

5CHN3LL

If the "incorrect" wear is the heavy wearing on the inboard shoulders, your negative camber is probably too aggressive. I run with mine maxed out because I want that bite under cornering loads - but I pay the price, especially with directional tires that are front/rear biased.

I run 34/38ish, since it's usually just me in the car.

Mbren1979

Stock psi on my C4S is way too high and harsh riding. I dropped to 32/36. Quite a big difference in ride quality.

Mark I

Porsche specifies different pressures for 18" and 17" tires. Based on your number, I guessing you have 17" tires. I'm on 17" Michelin PS3s (not the plus) and like about 37 psi much better.

Mbren1979

Im running 225 40 18 and 295 30 18

JTT

While I did experience this wear on the last set after lowering, the wear I am referring to is centres worn concave, while shoulders still with significant tread.

Mbren1979

Center wear is due to over inflation

cds72911

I’m running 32 front, 34 rear, gt3 rims on a c2.

Agent Jester

Fronts 33psi, rears 39psi. 19” wheels on a C4S

pmkazz

I have been running 32 F and 39 R forever. GT3 pressures..

Nacra

36/38

jadatis

Better question then what others do is "how low can you go for savety of tires.
This" Pigheaded Dutch selfdeclared tirepressure-specialist "can help you with determining this lowest safe pressure at wich even wear, best comfort and gripp.
Pressure advice was in earlyer days to give the tire a deflection for the speed, that wont overheat any part of rubber of tire, when driving that speed constantly.
This rule did not go for higher speeds as used by Porches sometimes , there they assumed this speed not to take that long and not with weights on tires for wich pressure was calculated.
I once got hold of the official formula that ETRTO ( european) uses , and went running with it.
Now use my own formula that is even saver.
Goal is to give the tire a heatproduction so deflection , the same as when maximum load and reference-pressure on and in tire.
So if you are only crusing , maximum speed you use and wont go over for even a minute, is probably below 140kmph/87mph.

If you give tirespecifications and data of car to determine the real weights on tire( the most tricky part in it all) , I can calculate a save lowest pressure with some reserve for unequall loading R/L, pressure loss in time or inacurate reading, etc etc.
Then you have maximum comfort and gripp , and save for the speed you use AND WONT GO OVER FOR EVEN A MINUTE!!!!!!!!!.
So if you are crusing, and you are passed by another Porche with higher speed, then dont go racing with him/her, then your tires will overheat, and beginning permanent damage is done. In time this damage will build up , whatever you do afterwards, and then mayby only after 2 years that much damage that the tire blows or treath seperation, and accident with only damage if you are lucky. Then you already forgotten that time that you raced 2 years ago, and blame the tiremaker or my determined lower pressure .

DeanClevername

I run a few PSI down from Porsche's 36/44 rec on the street. I think these are super safe pressures that sacrifice comfort to minimize overheating at prolonged high speeds from sidewall deflection, especially on the rears. At autox I run 30/34 and got to that rear number by chalking sidewalls, front landed there because that made the balance seem about right. If road comfort is a priority, I'd look for shocks that can provide you a better ride (old shocks can give you a sloppy but still harsh feeling ride). Running super low pressures just for comfort seems like a roundabout way of achieving your goal. You might also get an alignment that takes some negative camber out. More negative camber generally hurts ride quality. If you're just cruising, you probably won't miss the camber. Just mind that rear end when you do get after it somewhere twisty. If it's still too stiff riding, maybe a sports car is the wrong tool for your use case

wyovino

Why is everything with this car so complicated and subjective? I've been using the Porsche-provide numbers all along. With the conditions of the roads in my area, you risk losing fillings whenever you take the car out for a drive. I'll give lower pressures a try.