You say they're "perfect" so I assume the tread is good.
Have you driven on them and if so how do they ride? As long
as there's no rot or tread separation I think they'd be
safe. But that's just my unqualified opinion..
Sorry, should have been clearer. It's the spare tire which has 'never' been
used and was always in the trunk (dark and away from UV etc) - ie. brand new.
I'm told by 'qualified' people that a tire more than 5 years old that has
never had a load on it (ie never installed) is dangerous to use. I 'know'
that a 5 year old tire is perfectly good to use since I've done just that.
The question, though, how about a 15 year old tire.... I'm not sure anymore.
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