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Note: The above method of measuring stems is only
one of a plethora of methods employed - but is probably the most
popular one currently. Some manufacturers measure stems in
"degrees above horizontal" (common on road bikes, and
assuming ~72-3 degree head tube), "degrees from 90
degrees", etc. If in doubt, print out the chart, and use
it to guesstimate your stem's "degrees above horizontal"
value by aligning the bottom of the chart with a horizontal surface
and sighting the stem extension against the extension lines on the
chart. You'll usually be pretty close in estimating your head tube
angle at 73 degrees (road) or 71 degrees (MTB). So, to arrive
at "stem angle", add the head tube angle to the
"extension angle" from the chart and you'll have a number
that most bike shops can use.
To calculate the effect of raising a stem, add
0.96cm of rise for every 1.0cm of quill or steer tube you expose,
and subtract 0.30cm of reach.
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