What's the failure mode of a random rim
Random.
Typically? What are my chances of premature death or permanent injury, essentially?
What are my chances of death?
100%, unless it turns out that you're immortal.
There is no way of knowing how or whether a rim is going to fail, either after a prolonged period or prematurely, unless you do the kind of inspection which will cost several times the price of a new one.
@frankenbike started
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Random.