120- deg 21.1 Quill 22.2 mm Bicycle Stems
Stem angles are measured perpendicular to the clamp. For example, a 90 degree stem is straight. Sometimes, this may also be refered to as a 0 degree stem. If two measurements are listed, the stem can be flipped for angling up or down.
S.H.I.S clamp diameter is the steerer tube diameter.
Bar clamp diameter is the diamater of the handlebar.