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Discussion Starter · #1 ·
I took my car to the Porsche dealer to have a flat tire repaired. Turns out the nail was in the sidewall of the tire so had to buy a new tire. Car has 8,000 miles. All original tires. Replaced the left rear with a new Dunlop which is the same tire that came on the car new. A friend yesterday told me that the new tire might cause a problem with traction control even though car only has 8,000 miles. Any comments? Thanks
 

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Discussion Starter · #3 ·
Thanks Budman. I didn't think there would be a problem. Surely a top notch Porsche dealer wouldn't mount that tire if there was any chance of causing a handling problem or damage to traction control. Thanks again for your reply.
 

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You might want to check tread depths. If the difference between the new and old tire is more than a few 32nds, you certainly could have issues with traction control. One option is to shave the new tire to the diameter of the worn one.
 

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Discussion Starter · #6 ·
I called the Porsche dealer and spoke with the service manager. He tells me that Porsche says if there is 30% or more difference in tread depth they will replace both rear tires. They measured and I didn't have 30% difference. Also, he tells me that if there is a problem the light will come on and stay on. No light. I will also go buy a gauge and take a look myself. Thanks again
 

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I'd be rare to have less than 30% thread wear on a summer tire with 8K miles, even if you drive like a grandma, so yes, check them yourself;). An additional problem is the new tire will be grippier, since rubber degrades with age, plus the heating cycles, so I'd always replace both. Good luck.
 

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Oh, and the correct way to determine that 30% is USEFUL tread depth, not total tread depth, since you're not supposed to use the tires past their wear indicator, which typically is 4/32;). Something else to ponder.
 

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Discussion Starter · #9 ·
Thanks ELP_JC I don't race or track the car so tires look new. I guess I have worn the tire less than 30% according to my Porsche dealer. Talked to them today and they assure me I am OK. Thanks for everybody responses.
 
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