Originally Posted by johnny99
General rule of thumb: low stem is for people who rotate their hips forward on the saddle and ride with a flat back. High stem is for people with upright hips and curved back. If you rotate your hips forward, you can get a lot of lung power in a low riding position. Curving your back can restrict your breathing.
Not to be catty, but my hips rotate only around my center axis--they don't "rotate forward." Do you mean to roll forward, toward the front of your body, pulling your weight off the "sit bones?"