QuietJake, I'm echoing Gene's remark. Since I entered the Corvette world, there are lots of people who keep overage tires on their cars due to originality concerns when being judged for a show. From what I've learned, 5-6 years is about it for a set of tires regardless of miles due to various environmental breakdowns. Our 213 had about 24k on the original tires, but had lots of dryness cracking/age on the sidewalks. The tread was ample and had no cracking. I just wasn't comfortable anymore. I believe I paid about $150/tire, add in mount/balance and the total bill was $1100. I looked at it as good insurance against possible failure.