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That's typical. The added sidewall layer in an RFT is stiff enough to support the car with no air pressure. That means it can't absorb shocks like a go flat. If the sidewall is particularly short, as is the case with big rims and low profile tires, it has even less ability to resist damage. I hit a pothole with my '07 Altima so hard that it broke the front strut coil spring. The tire and wheel were fine. That was with 17" go flats.
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