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  #1  
Old 07-08-2002, 10:33 AM
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Join Date: Jul 1999
Location: Youngstown, OH
Posts: 150
4 Cupped Tires???!!!!

I have 4 fairly new (5000 miles) Yokohama Avid V4. I went in to have the tires rotated and balanced and asked them to check the suspension because I was getting a lot of road noise and road feel throught the seat AND the steering wheel.

The technician noticed ALL four tires were cupped. Their on a 1998 E320T (wagon) with 66,000 miles. Best guess from the tech is that the tires were not suitable for the car. Essentially they said:
1. The car was too heavy for the tires and,
2. the tires are designed to be run at 35 psi.

They're doing the standup thing and upgrading me to Michelins for only the price difference. I have NO complaint with the services. My question is, has anyone heard of this????????

Intruder

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  #2  
Old 07-09-2002, 11:28 AM
LarryBible
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It's not the brand you need to be paying close attention to. You do need a good brand, but load capacity is a very important consideration.

Good luck,
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  #3  
Old 07-09-2002, 03:53 PM
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Join Date: Mar 2002
Location: Great White North!!!!
Posts: 400
i would have thought the tech would check the tire rating against mercedes ratings.i think he would have to give you new tires-at the least!
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  #4  
Old 07-09-2002, 06:30 PM
LarryBible
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I expect that the load rating on these tires was within spec. That's not the point. Don't use the bare minimum, use something with greater load carrying capacity for longer tire life.

Have a great day,
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  #5  
Old 07-10-2002, 10:23 PM
Fimum Fit
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Cupping generally results from a standing wave effect in the tire tread

This can happen if a tire is badly unbalanced (or not properly dynamically balanced), or from a combination of a slight unbalance and bad shocks, or from an extreme misalignment. In rare cases, there may also be a mismatch of a particular tire design (usually only at a narrow pressure range) and the designed harmonics of the car's suspension. All of the above should result in vibrations easily perceptible to the driver long before the cupping is visible, and I can not imagine how any of them could happen to all four tires at once -- two at one end, perhaps, in rare cases, but not all four -- usually only one at a time. This is a real puzzle, unless the tires were a defective batch, like those notorious Firestones on Ford SUVs; I suppose that if someone with a pre-ABS car locked up all four brakes in a long skid and flat-spotted all four tires, and then didn't have them skimmed and rebalanced right away, it might cause all four to be cupped eventually.

Last edited by Fimum Fit; 07-11-2002 at 07:40 AM.
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  #6  
Old 07-13-2002, 09:03 AM
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Join Date: Jul 1999
Location: Youngstown, OH
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Thanks Fimum Fit,

That's the best opinion yet. That's be the one thing nagging me. Why or how ALL Four Tires? The car was balanced and aligned when the new tires were put on; it was smooth as a bell at 95 mph with no pull (I know that is only a one aspect of alignment!).

The ABS will "chirp" the rear tires in a panic stop. My "attentive driving" wife re-evaluates this from time to time. Dealer says the system is operating normally. But that only addresses the rears getting a flat spot.

Dealer says the suspension is tight; I've always felt the rear was a little too tight. If you've driven a corvette a little too fast over railroad tracks you know what I mean. It's hard/harsh on potholes; the interior sound like it's falling apart on a pothole. Again, dealer says it OK.

So, I'll switch to the Michelins and start from scratch.

Thanks,

Intruder
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  #7  
Old 07-22-2002, 08:45 AM
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Join Date: Jul 2002
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Yokohamas are noisy and prone to cupping, not to mention poor tire wear.
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  #8  
Old 08-02-2002, 02:46 AM
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Join Date: Jan 2001
Location: oregon
Posts: 2,013
The Yokohams on my SE are way quieter than the Michilens on my SD they also got excellent reviews
from a host of reviewers........

William Rogers....

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