This is an interesting subject. I have a 427 Corvette with 18 year old tires, 67 GTX with 12 year old tires and a Ford Lightning with 11 year old OEM tires. All look brand new, have very few miles and except for the Lightning, have never spent any appreciable time outside other than for drives. I've heard of the 10 year old standard also and most stories of old tire failures say there was usually no outward signs of age before they failed. A fair number of old tire failures on classics actually happen while they are parked in the garage. So, I don't know - I probably should be getting some new tires on the Corvette as they do worry me.
