Question about old tires??

[special-K]

Workinglonghorn,about all I got out of all that is a bunch of fear in liability mumbo.I didn`t see any explaination for what the actual problems could be.The only thing I saw was a reference to sunlight and about rubber (so-called) cracking,etc.When the rubber is deteriorated on the outside it`s obvious the tire is no good.I`m talking about what goes bad inside a tire casing to support this "buy new tires every six years whether they`re good or not" recommendation.I`ve never given age a thought and have run 20 year old tires with no problems.Those Firestones Wilderness` were new tires,not even 6 years old.No relation there.Back when tires were made of rubber,as in gum,they never checked.It`s all the additives that make them deteriorate.Rubber doesn`t go bad.Not in our lifetime.There are Firestone "Gum-Dippeds" on my friend`s `40 Harley.They are the original tires and are safe to ride.he rarely takes it out.But,guys have offered all kinds of money for those tires.
I just want to hear an actual explaination of what goes bad in a tire that can`t also go bad when they`re not so old.There are always flaws,but what does age cause that you can`t see?