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Explanation of Road Stem Angle(3 posts)

Explanation of Road Stem AngleMr Nick
Sep 23, 2003 6:36 PM
I am confused about road stem angle. I am used to mtb stem angles and for some reason bontrager uses the same angles for their road stems, but I would like to know how to figure out stem angle for all the other brands of stems. If someone could explain that would be great. For example is a 90 degree stem completely straight, or is it 90 degrees in relationship to head tube angle? And is an 84 degree stem 6 degrees up, 6 degrees down, or neither?

Thanks for teaching.
http://www.habcycles.com/fitting.html (nm)geeker
Sep 23, 2003 7:06 PM
stem angle...C-40
Sep 23, 2003 8:05 PM
In normal road terminology, a 73 degree stem is the traditional angle that produces a horizontal stem extension. Seldom used these days.

Most threadless stems have a greater angle to produce a slight rise to the extension. An 80 degree produces a 7 degree rise, an 84 produces an 11 degree rise, a 90 is perpendicular to the steering tube and produces a 17 degree rise.

Most threadless stems can be flipped to produce a greater rise to the extension. An 80 degree can be flipped to produce a 100 degree angle and a 27 degree rise. An 84 can be flipped to produce a 96 degree angle and 23 degrees of rise. A 73 degree stem can be flipped to a 107 degree angle, producing a 34 degree rise.