Most of my bikes are in the 63cm range and here are my impressions (FWIW) of four bikes with four different tube sets:

1971(?) Grandis, made from Columbus SL, according the folks there who answered my email. My lightest bike right now at 23.5 lbs, including a heavyish wheelset. The bike feels 'soft,' relatively flexy, super comfortable all-day rider. Has longest top tube of the four mentioned here, 24".


1983 Nishiki Landau, made from Tange 900, the heaviest of the four at a little over 26 lbs, (before fenders, luggage added) but that was as weighed with fairly heavy set of tires - Vittoria Rando Cross 28c. Feels heavier than the Grandis, a little slower, even though it's stiffer. Relatively lifeless feeling, but who knows, maybe with different wheels/tires...?


1985 Trek 600 Series, Reynolds 531cs. Notably stiffer and lighter than the Nishiki, way stiffer than the Grandis. Still comfortable to me for long rides, but I'm kind of an ironbutt who likes plain plastic Unicanitor saddles and that sort of thing. About 25 lbs. (with a lighter wheel set than shown here)


1987 Schwinn Tempo, Tenax tube set (which may or may not be Columbus SP, there's a lot of internet jibber jabber over this issue which makes interesting reading). About 24.5 lbs. Stiffest one of the four bikes and feels "sprintier" than the rest. Coincidentally, it's usually wearing my most modern wheel set (not the ones shown), which may have something to do with it. But even with a lesser wheelset (the ones shown), its performance seems a bit better than the other bikes, overall.