bittrl1000

The OE P Zero front tires on my 2012.5 991S look the same as those in the original post's picture, although they now have 27k miles on them and are only about 1mm away from the wear bars. The only issue I have with grip is understeer coming out of corners. The front gets very light, and the front tires just don't have the grip to hold a corner when I'm giving it significant throttle.

Now, I haven't driven many 911's, so I'm not sure how much of this is due to my tires being almost 5 years old with 27k miles.

dd356

Unless you use the VOC free tire products, most of these tire bright/conditioners severely promote dry rot. Nowadays detailers put them all over the tires. I've noticed a big difference using the Opti Bond tire gels. You won't get the look necessarily, but much easier on the tire. Most of those tire products dry out the rubber and expedite dry rot. I own 8 cars, and it's noticeably easier on the rubber.

ieatfishburritos

Thanks everyone for the feedback. My dealer has agreed to replace the tires out of good faith but notes these technically meet the documented CPO requirements. That is an outcome I can live with.

C4SJOHN

That is great news. I am sure that they wouldn't want Porsche to know that they CPO your car with bad tires. If I took my car in for service to the dealer with your tires on it for service the service department would tell me that the tire would need to be replace now. I am glad that it worked out good for you and your new to you Porsche..��

ieatfishburritos

Thanks John!

STG

Happy outcome. Good going.

smmmurf

Good to hear. These 991.1 cars need all the front grip they can get without RWS to help rotation. Torque vectoring helps a bit. You still need good front tires.

I had the same issue with my 2012.5. The original fronts weren't dry rotting too badly, but the grip level was way down compared to the rears that had been recently replaced.

Churchill

My fronts have some superficial dry-rot cracking, actually more than in OP's pic. As with so many topics on this forum, the dangers are being exaggerated. Just did a track weekend with them. Grip was phenomenal. Tires performed the same as the rears, which are a few months old. Drive them on the street every day -- perfect performance. Have even been driving 911's on summer tires in the winter for two decades, and am alive to tell about it!

GSIRM3

They are four years old. I wouldn't be surprised to see some cracks. Whether you should have a complaint regarding the CPO process is another story.

mwar99

Good result, they should replace them. As the other poster noted if you went in with those for service they would recommend replacement.

I found the PZeros to be crap compare to the MPSS. Noisy, wore horribly and grip fell off quickly with wear. Once I took those off the S6 I have I was much happier with grip, etc.

ieatfishburritos

Tires were replaced today with no charge and there is a noticeable difference. Thank you all for your input.

GregD

sometimes it's not even just looks/cracks, just old age... my original (4y old per date code) Goodyears looked brand new (not cracked like the Pirellis) but had the same grip as a wooden wagon wheel... They were replaced this w/e by new michelins (very new, in fact, born on aug 2016) and the new tires, while completely green, already have more grip on greasy roads still partially wet after a rain storm than my Goodyears had in the dry !!!! It's night and day !

So sometime even good looking old tires are just...old...

Needsdecaf

Well, it makes sense. Tire manufacturers have to make compromises when designing a tire. You want a tire that rides quietly, lasts a long time, gets great wet and dry grip (or snow grip!), profides good handling with excellent road feel and also has low rolling resistance to not affect fuel economy. Did I miss anything? LOL.

No one tire can do all that. And when you have tires that age longer than an expected life due to a car not being run very often, that rubber will age. Likely the manufacturers thought that most owners would go through a set of tires quickly enough that age would not be a factor, but in the case of a third / weekend / hobby car, that is thrown out the window.

GregD

yeah, that's generally not a problem for me. But I bought this car and it was essentially almost 4 years old (2013) and had only 12K miles !!! Those tires clocked out despite looking new...