spare tire falls off for no apparent reason

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My spare tire fell off for no apparent reason when i took a right turn on las vegas strip at 3mph. Almost hit a tourist as spare came bouncing off at them. Not considered a factory recall, yet I researched it and found about another 100 know times of other spares falling off. Supposaly the reason is related to never using or lowering the spare which eventually road vibration causes cable to saw itself apart.