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jb says that the decrease in tension of the lower spokes effectively support the hub. ie, measurement of spoke tension of a loaded wheel shows more of an lower spoke tension decrease than an upper spoke increase, so he postulates that the hub isn't really hanging off the upper spokes. tho as a radial system, isolating only top & bottom in discourse seems a problematic simplification. perhaps smarter minds can weigh in? haven't \*really\* put much thought into it, rather than a "huh, neat counter-intuitive concept".
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