Chris C.

If Tire Rack serves you an option, you can be assured it is safe. Some of them are N0/1 Porsche rated too.

You can read the Porsche POV here https://www.porschespokane.com/porsc...res-explained/

GrantG

Well, at a minimum, the Cup2 N0, P Zero Corsa N0, Goodyear Eagle F1 Supersport R N0, and Cup2 R Track Connect N0

Zero757

https://www.tirerack.com/tires/tires...omCompare1=yes
They are Porsche N-spec, 10mm wider and work on the 991.2 RS but should also fit on the stock GT3 rims as well...
Not a good option?

GrantG

Yeah, you can use the 991 RS sizes (265 & 325) as long as they don't rub. And be aware that the gearing will become a tiny bit taller with the slightly larger diameter on the rear tire (will accelerate a little less well - but very close to same). And the 265 fronts will have lots of grip, but will also follow cambers in the road even more.

GrantG

I definitely agree with this. I also think it's good to match the tire's recommended rim width range to the wheels being used, whenever possible.

Il CP

I would not run that mix. Those rears were specifically developed for the Panamera and the fronts you linked to are the rears for the 718. You might as well mix the rears with a BMW or Mercedes fronts.

The 265/35R20 and 325/30R21 is a great option, but use the "general purpose" non-OE specific set. They are the same type, and one rule is that if possible, don't mix OE tyres, not even within the same OEM.

One thing that is very important to understand, is that N spec, or any other OEM spec marking for that matter, has ZERO to do with things such as quality. It is all about the OEM requesting a tyre that has a few different attributes - for some it might even be slightly cheaper manufacturing. Sometimes non-OE specific tyres perform better in some instances, and when mixing things up like you would be doing by running the 718 rear as a front and the Panamera rear as a rear, you might be looking at a setup that is unpredictable.

Moral of the story is, that you don't really know what the tyre will do until you try it. But my experience is that it is best to run a matched set, being it OE or non-OE.

mqandil

your welcome. I am hoping someone will try the PS4S soon to see if they are significantly better on road than their close relative cousin CUP2. I suspect the stiffness of the CUP2 tires combined with new ball joints and new GT3 suspension components approaches a resonance (natural frequency of front end), causing the car to feel nervous, and using a softer tire shifts the overall stiffness of the car / front suspension away from that point. The PS4S is softer tire and hopefully it does the trick like the corsas.

Does anyone have the stiffness figures for both tires so we could compare, and
Has anyone tried the PS4S on the road. It will be great if they can share their experience.
Thanks

PRESERVER

(forgive if this is old/subjective info)
My experience on different car (S w/PCCB) is PS4s are stiffer than Pirellis, grippier that Pirellis (at street temps not track temps) better in the wet and more durable. As far as different tires' relative affect on resonance is concerned perhaps you need to consider whether you have PCCB or not, and that the Pirellis are heavier tires. If you want to stay OEM and are looking for the best street tire, you may be between a rock and a hard place. The real wild card is how the F1s are going to work on this car. I'm about to find that out... I"m no expert but I will report back on my subjective comparison between the three (albeit on different cars). Don't hold your breath, though, 1800 mile run-in? WTF?

tstafford

1800 mile run-in? What are you referencing?

PRESERVER

Google dredged up a Euro-spec Porsche recommended run in at 3000km, max 4KRPM. Hope you have a better number. Eagerly awaiting my Owner's Manual later this week.

raymort

1600 km (932 miles) with 7k limit.

PRESERVER

I like that MUCH better. Where'd it come from?

raymort

The car. You get a message every time the car starts up. Also, the rpm bands turn yellow and shift/blue at 7k to remind you.

It’s also in the manual somewhere.

Dr. G

The 992 TTS has a 2000 mile break in at 4K RPM max - maybe that's what you found.

Dr. G

I still don't understand why the ECU doesn't just limit the revs to 7K RPM for the break in period. It should be easily implemented and it wouldn't cripple the car.