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@EdwardZ
For a road bicycle its fine. The science behind it is bunk but the emprical bicycle frame models are bunk too and they derive from a model of KOPS... in other words its "Reductio ad absurdum".. so for road and track bicycles that have been designed for KOPS its fine.. for TT and recumbent bicycles its wrong.. For something like an English Roadster.. or worse still a Pedersen its...