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@gbj_tester
Perhaps I'll have to give up being subtle. Your proposition that small frames usually come with short stems because they have short head tubes is obvious bollocks. They usually have short stems because everything shrinks in proportion in order to keep the CG in roughly the same place relative to the wheelbase, so 45cm frame + 9cm stem is the same as 50cm frame + 10cm stem or 55cm frame and 11cm stem. There is no effect from lengthening the head tube on a normal fit, because those bigger bikes are fitted to people with longer legs, and they usually come with long top tubes too so the reach actually increases as seat tube increases, since only about ¼ of the top tube is behind the BB. That, by the way, is why you only need to add about ¼ of the increase in frame size to the stem to keep the fit triangle™ in proportion, because the other ¾ is provided by the section of the longer top tube which lies ahead of the BB