Originally Posted by
dd74
That's the thing. I don't know exactly the length I am looking for. I'm not certain how to measure stems.
Here's how you measure a stem
http://www.habcycles.com/fitting.html
You said the one you've got is too long...measure what you've got and look for something 10-20mm shorter, or go to your LBS and try out some different lengths and see what feels best.