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@gbj_tester
Imagine the spokes as a flat surface (canopy in the illustration) bounded by the rim which is a rigid hoop (perimeter posts/stays in the illustration). By lifting the centre of the canopy, you create strain which generates tension in the canopy which is reacted by hoop compression in the rim (tension in the guy ropes in the illustration). On Lightweights, the two spoke assemblies are manufactured flat and attached to the rim, then pulled apart at the centre and braced by the hub barrel (centre post in the illustration) which is inserted after tensioning.
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