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Originally Posted by 2000mc
Am I missing something? If it collapses in your hands, what keeps it from collapsing when your head hits a curb?
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If I understand correctly, the tapered segments are hinged on the outer surface and spread inside to fold. There seems to be a tri-lobed construction too.
The outer fabric shell would act as a compression ring to prevent the segments collapsing.
OTOH I've been wrong before. Once.