How long will tires last if stored off the wheels?

I have four almost new tires that have been stored in the basement for about 5 or 6 years, off the wheels. They are Bridgestone performance tires that came with a new BMW 745i and were replaced almost immediately. Are they likely to still be good?How long will tires last if stored off the wheels?
Tire aging is a hot topic in the industry. There is no consensus on how old a tire should be before being taken out of service but most tire manufacturers that have taken a position on this matter say 10 years from the date of manufacture.



In a high-performance in particular tire age decreases performance so that tires stored for several years, even if they have little or no wear will not provide the kind of grip they had when new.How long will tires last if stored off the wheels?
yes...How long will tires last if stored off the wheels?
They may be a bit dry rotteted,i sold my 89 fth ave and kept the original never used spare,and it's the same size that Chrysler put on the car in 89,15 inch and what ever,so thats a bit dry rotteted,but the thing still even has the original factory stickers on it,so examan the tire and if it isn't to rotted go ahead,but definataly try and get some newrer ones.