the biggest concern I see with any consumable, safety-related automotive product is consumer ignorance.
As was pointed out, there are entire cities worth of adult humans unable to wrap their brain around the concept of keeping their tires inflated. Every single day I'm behind at least one car with a tire so low it's making the car pitch to the side... and worn well enough to indicate it's been like that for weeks. Generally when I pass this moving hazard I look over and see the driver's vacuous glazed eyes... well, they have drivers' licenses too.
At least when the tire finally pops they do have to confront the fact that it needs to be replaced.
What of the tweel? Does it have a consistent/predictable/"safe"? failure point when it has outlived its usefulness or been damaged as a result of collision, abuse, or chance encounter with debris?
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