Originally Posted by
el_spumante
I think you are right. I don't know much about sizing, but this is what the ebay seller posted about the size:
"*DIMENSIONS The stand over height is approx 30 1/4". The distance from the floor to the top of the seat post clamp is approx 30 1/2". The distance from the center of the crank to the top of the seat post clamp is approx 21". The center of the handlebar stem to the center of the seat post is approx 21 1/2". The bike will accommodate most any rider comfortably. The seat height is easy to adjust."
Yes, these bikes were sized according to the seat tube length. The common men's sizes were 21" and 23". The top tubes were the same for both sizes: 22".