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It's OK for me at 15st, just don't use superlight spokes if you're worried about stiffness. Sapim CX or DT New Aero or similar shaped Pillar or CN will fit the On-One 24h hubs, or use DT Comps or equivalent if you don't want to splash out on bladed. I never had any question about the Ellipses with only 20 spokes, and that was when I was heavier and riding the tiny Calshot track which generates bigger loadings.
Is 24h gonna be alright for me at 13 stone? Would be track use only.