Originally Posted by
noglider
A good place to start is to place the nose of the saddle one inch (25mm) behind the vertical line formed by the crank spindle.
Don't move your saddle back or forward to adjust your reach. To adjust your reach, change your stem. Saddle fore-aft position is for your legs, not your arms.
Different opinions - I think it's for your balance on the bike - for me a sign of good balance is relaxed arms, low weight on the hands, and easy ability to raise up off the saddle. After that, adjust the reach with stem or bar reach adjustments.