Before you consider tread patterns and traction, you should consider the age of the tires. You don't need to be on the track for a tire to fail from old age. There have been a few recent articles stating the maximum safe age for any tire is five years. Some things I have read say six years, but anything older starts to become a real safety risk. You can look at the DOT stamp on the tire to determine the date of manufacture.
Tire Tech Information - Determining the Age of a Tire
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Greg
86 Coupe (stock - pretty much like Butzi designed it) - gone, but not forgotten
65 Ducati Monza 250 & 66 Monza Junior (project)
"if you are lucky enough to own a Porsche, you are lucky enough"
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