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My thought is that you are over-thinking this. I see no point in creating a crush zone.
In a light impact, like in a parking lot, any crush ruins the tube. Need a new one anyway, so what have you gained?
In a big wreck, the chances of the forces being in line with your tube are minimal, so your tube is likely to bend anyway. You will also need a new tube. What have you gained?
JR
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