Adjusting Saddle Height
How do you know what the correct height of your bicycle seat is? Listen to your body. Avoid injuries.
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Once you’ve used one of these formulas to get your saddle within a safe range, listen to your body to determine if you need to make small adjustments. Conventional wisdom says pain in the front of the knee indicates a saddle that’s too low, and pain in the back of the knee indicates a saddle that’s too high. This has been consistent with my experience. Many people may find their saddles were too low prior to using these methods (Rivendell’s Grant Petersen says 80% of the riders they see have their saddles adjusted too low). If you’re one of these people, give yourself time to adjust to the new position; it will feel strange at first, but in the long run you’ll be doing your knees a favor.
from Eco Velo