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I would like to focus solely on the safety aspect of running small spare tires in the back. More precisely on the probabillity of a sudden and unexpected blowout from what would be normal use for regular tires. I don't care about traction, I don't care about wear, I don't care about sudden failure from hitting a pot hole, I can compensate through the way I drive to account for that. All I care about is a which point will it unexpectedly fail if I drive on the highway at 50 mph. Assuming the spares are relatively new, say less than 4 years, or even brand new.
How are those tires constructed? Are they significantly structurally different than regular tires?
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