Stems have been made in a variety of extension angles over the decades. The common road versions usually have a roughly 72/73* degree angle to have the extension somewhat level. "Track" stems were often a deeper angle to further drop the bars. Tri stems and ATB stems often had the angle going up more for a higher bar height.


Lastly is the custom one off stem of specific height, length and angle, sometimes with extra bits to fit bells or bags. I have made more stems recently then previously due to the decreasing availability of factory made ones in differing dimensions. Like this one for a tandem. Andy