Firestone F70-14 tire replacement

[JGraft]

I have a 1968 RS/SS with these bias ply tires, the tires are at least 6 years old, does anyone have any technical data or recommendations on how often these tires should be replaced, externally the tires still appear to be in good condition.

Thx,
Jeff

[169INDY]

The Coker Extended purchasable (&&) Warranty is valid for 5 years.

Here is an interesting Discussion y.net

https://www.yenko.net/forum/showthread.php?t=176371&highlight=tire+life