Buying a new bike - How to Fit a Bicycle
Bicycle fitting is a subject most people find quite mysterious. Fitting systems with charts and graphs, computer software, measuring devices and "rules of thumb" make for a lot of confusion. But I believe it's really quite simple. Bicycle fit involves compromises. Compromises between comfort and performance, quick acceleration and handling stability, top speed and "taking in the scenery".
The link address is: http://www.peterwhitecycles.com/fitting.htm