Agreed. With a 30" trouser inseam, my ideal frame size is 55cm C-T, which is why I collected the three Capos and the Bianchi and why I gave my 57cm Peugeot PKN-10 to my elder son, who is 3" taller than I am. My 21" Peugeot UO-8 also fits me, by virtue of its proportionately long top tube.
I just barely pass the "crotch standover test" on my 55cm road bikes.
1959 Capo with Nervar Star crank and Campag. 980 derailleur upgrades and new Brooks Pro saddle.
Having said this, I confess to having bought a 23" Nishiki Competition and ridden it 40K miles until the frame broke at the bottom bracket shell. It was a bit tall for me, but compensated with an extremely short top tube. (It was so short that I bought a long-reach stem for it. In contrast, the PKN-10's top tube was so long for me that I needed a close-coupled, minimal-reach stem.) Many people have advised that top tube length may be even more important than seat tube length in frame sizing, although both obviously count.
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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
Last edited by John E; 03-20-22 at 08:57 AM.