Adding to the weight info, my '87 22" Circuit (21.5 c-c both seat and TT) is a hair over 21lbs with modern components.
I have an '87 23" Tempo with 9spd Ultegra and some heavier wheels and it was definitely somewhere around 24lbs. Tenax tubing feels much stiffer than the SL built Circuit though.
Buddy's '85 23" Peloton (Panasonic) with 9spd 105 if I remember correctly, 23lbs.
Tenax '87 Madison (Panasonic? Definitely Japanese) is also pretty heavy for a bare bones track bike. Not sure about the weight.
I love Schwinns from the 1980s!
