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Yes, the tire will fail, all tires fail. Tires are designed to fail. But if the estimated point of failure is 60,000 miles... then it's not really a problem. If the estimated point of failure is 10,000 miles... then obviously it is a problem. Meanwhile arguing with no facts about the science of it besides making it "weaker" doesn't prove anything. 1% weaker is nothing, 500% weaker is huge. No numbers are being discussed. If you break a leg after it heals it may be "weaker" but it's still going to last you your whole life. If you hit a home run with a wood baseball bat it will be "weaker" but it doesn't mean it doesn't have 500 more home runs in it. More and less are simple concepts to define larger or smaller amounts. To not define the degree of more and less is useless to argue. Can I have more coffee please? 3 drops is more, an overflowing cup is more. Obviously in that case you just want the cup topped off, but its a pre-determined amount that the person pouring assumes based on experience. If you only want a half a cup you have to specify that amount. We're not talking about amounts, we're talking about more or less.
If that's the case, with my understanding of physics I can say... Yes, I believe you're right. The tire will last less time than would be possible without stretching. But do I agree it's unsafe, or won't last the life of the tread? No.
I'm not trying to be a dick at this point. I'm not attacking either of you, I'm merely clarifying in different ways to see if you can understand what I'm saying. Sometimes when talking to people it requires explaining in different ways what you're trying to convey. I'm not belittling, I'm merely trying to get you to look at the argument from the other side using real world examples.
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