I bought a new set of Pirelli pzero nero m&s tires about 2 years ago with my aftermarket wheels from edgeracing.com.
In July of this year, one of the tires blew out.

Where you can see red here is where the tires came apart. All around the tire, those little "fangs" all blew out, tearing at those grooves.
As I walked to my car this afternoon, I noticed that one of the other tires is cracking very badly there. I've noticed that the cracking actually extends a bit off the tip of the "fangs".
I just know that this means this tire is going to blow out the same way.

What can I do about this?
I feel like this is a safety issue, and that Pirelli should be responsible for taking care of this.
I just bought another of these tires after the first one blew out, thinking that it was just what happened after riding on the flat tire.
Now that I see this one doing it, it seems like the tires are defective.
I regret buying them, and especially the last one I bought.
Will Pirelli help me out at all?
I want different tires, because I don't feel safe driving around on these anymore.
But I don't know the likelihood of Pirelli offering me different replacement tires.

If anyone has any insight, I appreciate it. I'm not sure what I can do.

 

The problem you are going to face is that edgeracing is not an authorized dealer. So you will have a hard time getting them back to pirelli.

 

Hard to tell without seeing the actual tire damage.

Are you oversized or running OEM size? What pressure? How many miles?

 

also, they'll ask for an alignment as the car is

 

I spent over 13 years of my life in the tire biz and have never seen a defective tire "blow out." The chances of it happening to a single tire, let alone 2 on the same vehicle are so slim, you may want to think of buying a power ball ticket tonight because I bet your odds are better at winning that. Any time I have seen a tire "blow out" there has been an outside force involved. The major brand tires have such good quality control, its very rare a defective tire will ever make it to the consumer. Further, most defects(they do happen) present themselves upon installation or a day after, I have never seen a tire just "let go" after 2 years.

With out seeing the tire there is no way of telling what really happened, by any chance is there foul smelling "tire dust" remaining in the tire?

 

CL came with 16", these are 18", I can't recall the other dimensions right now.
I had them at 40psi when I first got them. Soon after, a tire shop (while getting an alignment) said they should be at 35, so that's what they've been at since.
That was over a year ago, and the first tire went out just about 3 months ago.

I'm not sure if "blow out" is the right term, but I was just driving down the highway and suddenly had a flat.
I pulled over, checked it out, and every one of those fangs had torn open.
Now this other tire has cracks all in the grooves of the fangs, even extending another half inch or so.
There's probably about 15k miles on these tires, still a good bit of tread left.
I have a busted CV joint on the shaft that this tire is on, and the last one was on the same side, only in the rear.

In the tire that went out on me in July? Or this one?
There was a bad odor in the one that went out on me.



Would a poor alignment affect these grooves? CV joint being busted?
Improper inflation? - how can I know if 35 is in fact the correct pressure?

If it's that unlikely that I got two bad tires, then it must be something I'm doing or something wrong with the car, but I don't know what that is.

 

After closer inspection, I realize that this tire is under inflated. The section of the sidewall closest to the ground is showing the most obvious stress.
One of my valve stems was leaky in the past, but then it was fine.
It could be leaking again, or it could just be my own failure to attend to the tire pressure.
Unwisely, I haven't checked the pressure all too recently, and it was difficult to see that this tire was in need of air. All the other tires are at a normal pressure, and the low profiles are tricky when trying to eye inflation. I must be more dutiful about checking the pressure, because this is just crapping all over my week.


For prevention of this happening again:
1. Can I cheaply replace valve stem themselves?
2. How do I find out the true, recommended pressure at which the tires should be?

Thanks for your help

 

1. Is it the actual stem or the screw in valve? The valve is real easy.

2. Look at the sticker on the door jamb.

 

1) The valve stems can be replaced by a tire shop- the tire will need to be deflated and partly removed to get at the valve stem, but it's not complicated. Cost is maybe $10-$20 per tire.
2) The "recommended" pressure (measured when the tire is cold) would be set by the wheel manufacturer for aftermarket wheels. If you have it, look at your paperwork for your wheels. Also check Tirerack.com to see if it has any info on this.
FWIW, if you are on 50 or lower profile tires on 18" wheels, my guess is that you're looking at a minimum of 35 psi. The A-spec 18" wheels for the 3G TLs recommend 39F/36R. Drivers (and you) can vary the tire pressure to change the ride, comfort and handling within a certain range, but I wouldn't go over 40 psi for a street tire.

 

I'm not sure exactly what the problem is
Since my tire size is completely different from the stock size, I thought it would be a different pressure.


Thanks, I will have them take a look at it.
I did check my paperwork, and unfortunately, there's no information on it. I can't find any information online about it either. I may just be looking in all the wrong places.
Thanks for the info. I guess they are probably at a decent pressure, save this one tire.





Thanks again for your help!