Pelican Parts Forums - Storing tires

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What is the best way to store tires?

I just received a nice new set of Yokohama's, but still have lots of tread left on the Bridgestone's. Probably won't need the Yoko's for a year or so...

1) Store them flat on the basement concrete?
2) Upright on their treads on the basement concrete?
3) Hang 'em from the rafters?

Having a spare set of tires is a luxury I am not used to, but Tirerack was having such a good sale even my wife was convinced buying a new set was a wise idea.

Thanks in advance,

Ozone and sunlight are the killers...

Basement is good temperature controlled env. Seal them in platic garbage bags... Better if the are on sides or hanging to prevent flat spots...