I say keep them, but once they sit for more than a couple of years, they are no longer serviceable from a safety stand point, unless they are new now. Check the DOT number on the tires, I would not keep them as a usable tire four or five years past the DOT date stamp, and then only if stored out of the sun.
You could use them as exercise drags on the beach when training for that future Everest climb, or have someone fab up a couple of flanges to use them on an olympic weight lifting bar and keep them for exercising your Jerk, Clean, or Snatch. -Thats what I did with my original Jeep tires/rims.
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