55cm C-T is my size.
With traditional road bikes, I find I am extremely sensitive to frame size and fit, which is why I gave my 56cm C-C (57.5 or so C-T) PKN-10 to my elder son, who stands 5'11" and looks just about right on it. He has been riding it every week with the San Diego Bicycle Club's C or C- group.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069