Before the 90's, large frames were in fashion. It was not uncommon to
see people on bikes where the saddle was nearly on the toptube. As a
near 7-footer myself (6'10"), I've ridden several of these old frames.
The 27"/68cm size that was so common years ago is virtually unknown in
new frames today.

My flea market $25 special is a 27 inch Puget and it had the handlebars way
up and the seat was about 8 inches off the post. A truly tall person rode
this. With the seat sitting on the toptube it is just a little big for my
6'1" self.

LB