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@.gaz.
Has anyone mentioned the obvious thing of measuring the rear spacing before deciding on which groupset to buy?
130mm for modern stuff, 126mm for older stuff.
Plenty of 90s (and onwards) steel frames have 130mm spacing.
Sorry if this is obvious noob info.
I went for a steel frame with used Chorus + Veloce 10spd group, and modern-but-retro bits like nitto / flite / open pros etc and I love it.
Another thing to think about with sizing is that if you go for a flat bar to hoods transition (like with most compact bars) then it's handy to drop a cm or two of down tube size (and show a bit more seatpost) so your hands are in a similar place to where they were with the brake levers further down on the bars. If that makes sense.