[williamoss]

I looked on the outside of my Sumotoro tires and could not find anything that looked like a date of manufacturer. I know that tires of 6 yrs or older should be traded in for new ones as the rubber dries out, but how do I know how old my tires are now. My Sumotoro tires are ZR17 inch. I use the car as a day driver and in autocross. Any suggestions for this car. My original "924 D production" came with Perrelli P6 I think but that was 30 years ago. Those were very sticky and would last for about 20,000 or so.



William Moss

Tigard OR





[size="7"]Yes but how do i find the age of the tire?[/size]

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[DaveN]

Not sure why you would change brands? Everyone here (?) has had nothing but positive things to say about Sunitomo tires and their price. When my Proxes 4's wear out I am going to Sumitomo or Khumo without hesitation. I hear Khumo's are subject to flat-spotting but other than that both good, reasonably priced tires.

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[chudson]

I once stumbled on a publication that stated tires should not be installed after 6 years of age and not remain in service after 10. The way most tires dry rot today, at 6 years of age most tires are past done and I take issue with the recommendations as stated in that article. If I spot 6 year old tires on a customer's car I suggest that they replace them.



That being said my coupe is sitting on 6 year old P Zeros as we speak. I monitor them closely and never drive over 175 MPH........ <img src="/forum/images/smilies/968/biggrin.gif" class="smilie" alt="" />

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[chudson]

williamoss - here



http://www.tirerack.com/tires/tiretech/t...techid=11&



..and if it's not on the outer sidewall look on the inner

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[rxter]

I would imagine that tires age differently depending on conditions. THey'll last longer in Tigard in a garage than in Tucson in the sun. And it depends on what you use them for. Around towning or canyon carving/tracking. In any event 6 to 10 years seems like a stretch. I had Yoko S4's and liked them very much.

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[flash]

the S0-3s i had on the blue car were noticeably hardened at 5 years, yet only had about 10k on them, and spent most of their time in the garage, and a lot in the air

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[Jamie '92 968]

William,



The easy answer in your particular case would be to call the previous owner and ask him... <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" />



If I remember correctly, he put those tires on your car in late 2009, so they are a bit over a year old. I drove the car when he had just put them on. In fact, they still had bits of stickers on the tread.



Jamie

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