Measured vertically from the center of the handlebar clamp to an imaginary line that bisects the central meeting point of the extension and vertical portion of the stem. Rise (mm): The effective height gained as a function of the stem's angle and length.For example, if a manufacturer advertises a 7 degree angle using Angle A, we may describe this as 97 degree. This change in length would give you a much more. If you were to buy a 60 mm stem with a 10 angle, your stack would reach the desired value (from 49.74 to 35.27 mm), but your reach would increase (33.55 to 48.54 mm). You now want to lower your stack by 15 mm. A simple way to look at this difference is the following: Angle B = Angle A + 90 degrees. This means that the reach of your stem is 33.55 mm and the stack is 49.74 mm.This is what we usually refer to when referring to the stem angle. Angle B: Measured from the center of the actual steering axis to the center of the stem extension.Angle A: Measured from an imaginary line perpendicular to the steering axis to the center of the stem extension.On stems with built-in rise this measurement will be made along an imaginary line (as seen in the diagram). Reach (mm): The effective length of the stem measured from the centerpoint of the steering bore to the center of the handlebar clamp without accounting for rise.We often refer to this as the stem length Extension (mm): The actual length of the stem from the center of the steering bore to the center of the handlebar clamp.
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