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Hi all,

Was on the highway yesterday about 75mph when the road felt a little rough (they have been redoing the road so didn't think it was too odd) then within an instant felt like a flat tire and somehow I got over very quickly and came to a stop right at an exit. As I stop, I look out my passenger window and see the bulk of my right rear tire roll past me. Can't believe I didn't damage the wheel (20" turbo wheel). So here's the background and a question: I have 20" for summer, 18" for winter, and I was running Bridgestone Dueler H/L Alenza SL P275/45R-20. I actually put them on the car ('03 Cayenne S) in March of 2006, however they have about 40k on them and not at tread bar yet with still good tread - I was getting one last season out of them before replacement next spring. Since the rubber was near 8 years old, did they just break down? Should I consider age as well as tread ware when considering replacing tires in the future? Appreciate your advice all...

Ken

post-51163-0-09766700-1402595556_thumb.j

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I think the recommendation is replacing tires that are older than 6 yrs so your tire was overdue. The rubber just deteriorate/crack in time.

Is it possible that it was under inflated?

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I think the recommendation is replacing tires that are older than 6 yrs so your tire was overdue. The rubber just deteriorate/crack in time.

Is it possible that it was under inflated?

This is correct. The Porsche TSBs state that 6 years is the maximum age for tires. Obviously, they may last longer than that, but the rubber does begin to deteriorate. I'd be afraid to run 8 year old tires on any vehicle for fear of what happened to your tire.

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