I couldn't agree more. Buying used can be very tedious. That can lead to a frustrated buyer and seller. I know... I tried to buy a Serotta Ott Rott online recently. The seller just wanted to unload and I wanted all the minutia of angles and tub lengths so I could be absolutely sure of the fit before I bought it. Eventually, he found a buyer that just pulled the trigger and bought the frame.

Top tube length is more important than seat tube length. Taller people tend to have the same torso length as people who are more in the norm with height. They are often "normal sized peole with longer legs. Get your personal top tube range set clearly before you shop. Then you'll be able to guage the virtual top tube length on any bike you shop. Virtual measures true horizontal for frames with sloping top tubes.

In the end though, you'd be much better served with a pro fit from a qualified shop.