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-   -   Gary : Tire manufacturing defects? (http://forum.e46fanatics.com/showthread.php?t=291547)

jpr 09-08-2005 08:02 AM

Gary : Tire manufacturing defects?
Gary - appreciate your insight and experience on this one

How common are tire manufacturing defects? It seems like stock alignment guy excuse #1 is "bad tire", which for a new-ish tire implies that it has some sort of manufacturing defect. However, my guess is that in modern reputable tire manufacturing plants, defects are exceedingly rare, and those that do occur are caught in a quality control check long before the reach the consumer.
What has your exerience been? In the undoubtedly high volume of tires to pass through the tirerack, how many if any confirmed cases do you actually have of bad tires coming from the manufacturer?

( I don't know if you are interested, but here's the orginal thread which prompted the question. )

Alex@Tirerack 09-09-2005 04:42 PM

Sorry for the latent reply.... With the high volumes we see @ Tirerack its a fair statement that .5 % of any vendor's production volume +/- is an average defective rate.

A common misconceeption as well - street tires if defective will likely show evidence day 1 - tires dont "become defective"

jpr 09-09-2005 07:21 PM

Thanks for the info - that's actually a much higher rate than I would have expected. Just to make sure I understand and we're talking apple-apple,
By "manufacturing defect" I was thinking about an apparently okay tire that doesn't ride properly, i.e. not round, not straight, bubble in the sidewall. Is that the same meaning you had in mind?
Do you really have problems with about 1 out of every 200 tires, more or less 1 out of every 50 people who buy a set of 4?
Also, I'd imagine the number of complaints about "defective tires" is different from the actual number of defective ones. Are ever able to individually examine a returned tire and verify a problem? If so, ae certain types of problems more common than others?
Is there much variation in between vendors? That is, does the big brand name make a difference in quality that is worth considering paying more for?

jpr 09-15-2005 05:45 PM

Has anyone here actually experienced a real confirmed no-kidding defective tire?

geri 09-16-2005 01:17 PM

Longish tire story(s) and a question
Yes I have experienced tire defects, but not with my BMWs. Many years ago I had one in a set of Falkens (don't remember the model) on a Porsche I owned. After rotating the wheels I began to think that one of my ball joints was failing. You could really feel a vibration in the front end at certain speeds. It was suggested that I have the wheels rebalanced. Only one required it and after rebalancing with considerable weight the wheel still proved problematic on the front of the car. As it turned out the tire was both out of round and a little lopsided. I replaced it and the problem was resolved.

Fast forward to a couple months ago when I purchased tires for my JEEP, BF Goodrich All terrain TA KOs in 31x 10.5. When i went to pay the clerk notified me that one of my wheels was severely bent and proved very difficult to balance. "Nothing doing" I said as the wheels are beefy alloys in perfect condition. They showed me the wheel on the car and I'll bet you there was a pound of wheel weights on it! I suggested that the tire was defective. They (Costco) disagreed, saying first that it was "impossible", "never happens", "never seen it before in all their experience", "quality control too tight", "lots of SUVs with bent wheels", bla, bla, bla...... I insisted and argued further that performance and safety could be compromised. They countered that yes it could, and that is why I would have to sign a release before they gave me the car back. "Ridiculous", I said, "give me another tire". They resisted. "Okay then swap out the wheel with the one on my full size spare. If you can't balance that one you have to admit that it is the tire". I also noted that their life could be made easier by just putting a new tire on the questionable rim and if it balanced up okay it had to be the tire. Noooooooooo, they insisted on changing out both the spare and the other wheel saying rather smugly that if my wheel was the problem I would have to pay for two additional mounting and balancing charges. I said fine and why not make it interesting? I'll bet you $100 that it is the tire. Well they wouldn't take the bet, and yes in the end it was the tire.

Bottom line there are defective tires and it can be up to the buyer to do the ultimate quality control. I'd be interested to know what the industry considers to be the maximum allowable weight for proper balance before a tire is considered defective.

jpr 09-16-2005 04:04 PM


Originally Posted by geri
I'd be interested to know what the industry considers to be the maximum allowable weight for proper balance before a tire is considered defective.

Now THAT is very good question....

Thanks for the interesting stories - Moral of the story seems to be that just because it might be rare doesn't mean it isn't happening to you.

My memory is fuzzy, but I seem to recall that last time I got tires, the guy mounting them ran the bare rims in the balance machine to verify no big problems before he mounted the tires.

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