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Old 08-18-2005, 01:04 AM   #1
ImportVenom
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Default Pics of uneven front tire wear (Pzero nero m&s) - diagnose my pics

Hey all,

I have about 7k miles on these PZero Nero M&S Z-rated tires. I've noticed uneven wear on both front tires, near the outer edges. The rear tires are perfectly normal. The last time I got an alignment, I had them do zero toe on all four shops, but that was done almost a year ago. Is the wear in the pics normal? I do drive pretty hard, and it has been through one mini-autocross.

Below are 3 pics of the uneven wear on the driver's side front tire. The front tire tread is pretty much almost worn flat right at the edge of the channel (one of the four parallel channels down the tire). The passenger side front tire is identical (with wear near the outer edge). I've also included a pic of how the rear tires look (normal wear). I'm thinking the wear might just be from aggressive driving. Does this look like an alignment issue to you? The car drives perfectly straight on flat roads.

Thanks!







REAR TIRE (NORMAL)
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Old 08-18-2005, 01:21 AM   #2
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....rotate them more often.
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Old 08-18-2005, 02:55 AM   #3
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Looks like your aggresive driving style coupled with lack of negative camber is contributing to tire wear on the outside shoulder.
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Old 08-18-2005, 04:31 AM   #4
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Positive camber on the INNER tire during cornering, and Its dragging the tire along that edge due to " ackerman ". ( the inner tire turns sharper to make up for the inner and outer tires turn radius.). Go a little further in the neg camber range and possibly a bit of toe IN on the front.
Set your tire inflation by temperature. Drive the car hard around some corners, and immediatly jump out and check temp. ( a laser temp guage can be gotten from costco for like 40 bucks ) Adjust till the temp is even across the tread face, hotter in the center, too much air. Hotter on the shoulders, not enough air.

If it was your driving, it would not wear that far inside. It would have killed the very edge of the tread and down the sidewall,.
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Old 08-18-2005, 12:35 PM   #5
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not enough negative camber
You drive too hard (not a flaw, but wears tires like that)
toe in

Could be any or all of the above.
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Old 08-18-2005, 01:54 PM   #6
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Is the camber on the front tires adjustable with the stock suspension? I think I asked them to do the rear camber as negative as possible. The toe was set at 0 on all four corners. Davenow, are you saying I should set the toe in a bit, or are you saying that the toe might already be "in", causing the extra wear. I think you're hinting at the latter. The strange thing to me is that it is such a short edge of the tread that is worn out. If it was bad toe, wouldn't it cause a larger patch of the tire to be worn out (not just that one edge)? Thanks again!
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Old 10-15-2006, 12:59 PM   #7
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Edited for deletion of comments..old post..too early
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Old 10-22-2006, 12:20 AM   #8
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I know its old post but the seems looking uneven tire wear is actually by designed (discovered today).

- Charles
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Old 10-22-2006, 01:02 AM   #9
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Quote:
Originally Posted by chaddeus View Post
I know its old post but the seems looking uneven tire wear is actually by designed (discovered today).

- Charles
Did the shop tell you why they thought it was by design? Both the alignment shop and the tire shop attributed it to hard cornering. I'm pretty sure I need more negative camber. Also, the tire shop could not give me trade-in cash for the tires because the edges were so worn, even though the rest of the tread wear was even, and still had a bit of life in it.
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Old 10-22-2006, 04:49 AM   #10
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Quote:
Originally Posted by ImportVenom View Post
Did the shop tell you why they thought it was by design? Both the alignment shop and the tire shop attributed it to hard cornering. I'm pretty sure I need more negative camber. Also, the tire shop could not give me trade-in cash for the tires because the edges were so worn, even though the rest of the tread wear was even, and still had a bit of life in it.
if you look closer, its by design. You got to measure all the thickness. It seems that other parts of the tires are cut deeper than the outer most.

Maybe you are experiencing serious wear on the outer but the outer tire . If you can seperate the tire into part 1-5, part 1 being the outer tire, 5 being the inner, you'll see that the grooves of part are deeper! However, part 1 and part 2 is pretty level to you measure it across the tire.



- Charles

Last edited by chaddeus; 10-22-2006 at 01:53 PM.
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Old 10-22-2006, 05:02 PM   #11
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Hmmm are you sure that the tread is cut uneven across the tire? Perhaps your tires were just worn more on the outer tread sections than the inner, leading you to see uneven tread depth across the entire tire? Or maybe you're right...unfortunately I no longer have these tires so I can't check out how mine looked...

Have you looked at a brand new pzero nero? I'm pretty sure what both you and I experienced is not normal. I basically wore out the outer edge of the tread before the rest of the tire's tread. Here's a pic of the tire from Tire Rack:



1000x1000 larger view:
http://www.tirerack.com/tires/BigPic...ero+Nero+M%26S
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Old 10-23-2006, 10:01 PM   #12
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seeing the picture confirms my idea. You aren't looking hard enough!! If you see the picture below, compare the white mark with the yellow mark. Did you see that the white mark are some what thinner (not cut deep) than the yellow mark? You can compare it inner and outer or both outer and you'll get the same results; that the outer is not cut deep enough to make it equial



- Charles
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Old 10-24-2006, 12:18 AM   #13
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Yup, you're right! Wonder why Pirelli does this, and why some people still have even wear. This sucks though because I basically threw away a set of Pirellis that I probably could have kept a bit longer (since the rest of the tread was deeper than the fully worn out edge section).

BTW, here's a pic of my Pzero nero m&s after only 15k miles...notice how the tread on that outer edge section is completely gone...

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Old 10-24-2006, 10:05 AM   #14
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My Pzeros look exactly like ImportVenom's tires. I have 30k on tires and are getting replaced tomorrow.
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Old 10-24-2006, 05:29 PM   #15
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Quote:
Originally Posted by ImportVenom View Post
Yup, you're right! Wonder why Pirelli does this, and why some people still have even wear. This sucks though because I basically threw away a set of Pirellis that I probably could have kept a bit longer (since the rest of the tread was deeper than the fully worn out edge section).

BTW, here's a pic of my Pzero nero m&s after only 15k miles...notice how the tread on that outer edge section is completely gone...

My guess would be for grip. Less groove = more grip.

- Charles
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Old 11-25-2006, 03:15 PM   #16
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I would agree with charles. It looks like Pirelli designed the outside row of tread with shallower sipes to provided more cornering stability by having treadblocks that have less squirm (due to "full" depth). Almost like have shaved tires just on the outside tread face.
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