I contend that they are “good enough” for a few thousand miles, and the engineers don’t care beyond that. They probably get some kick back from Goodyear. Goodyear tires are crap and I don’t trust them, especially after developing a weak spot bulge after 2,000 miles on my 991.2. On my Cayman, they were totally worn at 10K miles. They ride hard and don’t grip as well. I am not alone in this opinion, and it’s hard as hell to find somebody that loves them. So salute to you!

 

My car handles great with the Michelin PS4S tires on and I currently have the highest acceleration G in the Max G thread.

 

I do not know why Porsche chooses Pirelli for Nürburgring.
Maybe due to track record/data of Pirelli from F1.

But Pirelli is my first choice on motorcycle/superbike.

 

We had Pirellis on our Cayenne and two of the tires developed weak spots/bulges in the sidewall. One blew out just as we were leaving a gas station to get back on the highway and I’ve never been so happy for a disaster to occur at the right moment. Ever since then I’ve been spooked by their car tires (I know it’s anomalous) but as mentioned above they make great bike buns.

 

Mine came with Pirelli PZ4, only 1400 miles in but they feel really good, not driven in the wet properly yet. I'm curious what sucks so bad about the goodyears?

 

Not sure... but he said the other day he swapped the rubber the day he got the car and even clarified that he didn't have a deal and had to pay full price for the tires...

 

Tire selection for production cars works roughly like this:

1) Are the tires of interest available in the quantities that are needed for the program = may take multiple suppliers to meet the full quantity
2) Of the tires that are available in the needed quantities will they be safe under the intended usage = nobody knowingly violates this
3) Of the tires that pass the second step what is their impact on emissions certification and fuel economy
4) Of the tires that pass the 3rd step how good are they for noise and handling - forced ranked against each other
5) How does the price versus the noise and handling compare
6) Will one of these tire options from 5 be good for magazine tests and advertised performance claims - if no add in a tire that is not at a good price as limited usage or as an option
7) How durable are the preferred choices and do any of them have better marketing perception

A few companies go straight to Michelin, Pirelli or Bridgestone for history or marketing reasons. Others test and quote their way there or to other suppliers.

 

I run 305 Porsche NO rated Michelin PS4S on my 991.1 TTS with RWS. Is the fitment for the 992 very different?

 

the problem is I don't think there is a 305/30/R21 PS4S... so I'd have to go with a 315... which the "rub" ... if you catch my drift.

 

While made in Germany, the F1's appear to be engineered by former Michelin engineers.... note the French accents on everyone! 😂