Originally Posted by
blilrat
My Serotta is 20.2lbs on the bathroom scale. From this thread, it looks like a sub 20 lb vintage bike is tough to do.
Actually it's not so difficult if you start with a mid level bike like Supervitus 980 framed Peugeot PSV which is genuinely a 21 pound bike in 56cm size, with it's OEM components. Just change out a few of the components with lighter replacements and a tubular wheelset, and you'll be surely in sub 20# territory.
I was able turn get mine down to 19.25 pounds with a lighter saddle, a Mavic 801 drivertrain, Stronglight 106 crankset, Spidel LS brakeset, modern Look Keo Classic pedals and a Mavic 330GL rimmed wheelset.

My 1984 Peugeot PSV as described, but wearing period correct PP76 Look pedals in this pic.