Originally Posted by
nymtber
Make sure your saddle is set properly first, then worry about stem length. I agree with Clifton to try a few sizes at the LBS first, it would be a lot easier. Then buy one you need/order one.
I think this is good advice. First consider the position of your saddle. Google up KOPS, Knees Over Pedal Spindle. This is a good place to start.