Bike Sizing?

Wedge a big book up under your undercarriage as if you were sitting on it like a saddle. Push it hard up there and hard against a wall, making sure it's top is horizontal. Bare feet, flat on the floor. This is easier with an understanding assistant :) When you have the book all setup, mark a line on the wall at the top of the spine.. use this for further calcs to get a saddle height start point.

Remember when we realised doing this could be used to measure inside leg as well; that was a fun evening. Though I still feel bad about using the Bible. And even worse about sniffing the cover in church the next Sunday.