Quote:
Originally Posted by ZER026D
Luke at tire rack said to store them on there side stacked so I dont get flat spots.... Now I am confused..
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Unmounted,
there 
own weight will deform the sidewalls especially of the bottom tire. A single tire's weight is unlikely to hurt itself vertically, but may flat spot if mounted with the added weight of the wheel especially if they loose pressure.
Mounted, if you keep them aired up, it probably doesn't matter...