I believe browning doesn't affect anything but the aesthetics of the tire, and it can be fixed with some tire gloss.I'd recommend bagging them as well. You can get some large heavy mil trash bags at home depot or lowes that work well. This prevents them from turning brown as they age and drying out. Some people use a shopvac to get the air out of the bag. I usually spin the bag, fold the bag flap under the tire, and stack vertically.
I use my winter tires for pretty much the life of the car, stored for probably 8 months at a time every year. Personally I'd rather have a matte black tire than one with shine on it, but to each his own.
i was very confused at how many people were storing tires regularly, until i remembered there were places in the world that needed different tires for different seasons...
Can they be stacked on their sides or should they be in a vertical manner like:
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