Not one of the brands you mention, but I have here a 1984 Miyata 310 woman's frame made of double butted chrome moly with a seat post stamped 26.7.
At 10:12 AM 26/12/2008 -0600, Mark Stonich wrote:
>Schwinn Paramount, Cinelli, Colgago, Grandis and I assume others,
>built lightweight "Woman's" frames (not mixtes).
>
>If any of you own one, or have a significant other who does, I would
>appreciate knowing the seatpost diameter. This will tell me the wall
>thickness used in the seat tubes.
>
>It's time to build Jane a new, lighter bike. Since building her 531
>mixte in '80 I have come to the conclusion that the mixte is the
>superior design only when lower grade steels are used. They sure are
>pretty though.
>
>Mark Stonich;
/john