Originally Posted by Jeff Neese

Do yourself a favor - read this article. Pay attention to the section on the Lemond method and the Hamley method. They usually give almost the exact same result. That has always worked for me, on my own bikes and bikes that I am setting up for other people. There are other methods described in the article but actually measuring your inseam and using a formula will get you 95% there.

How to set the saddle height on your bike