Mark,
Sutherlands is concerned with fitting forks to existing frames. The stack height is used to determine the length of the steerer to fit a particular headset and headtube.
Later,
Jim Allen
Mark A. Perkins wrote:
> Hello again everyone:
>
> Seeing all of these messages mentioning stack heights has brought to mind
> a question I have regarding this dimension.
>
> If you are referring to a listed measurment such as in a Sutherland's
> Manual (mine is in storage at present - several hundred miles away), does
> the measurement include the upper as well as the lower components of the
> headset? For it is only the lower components which will make a
> difference in the relationship between the fork crown and the bottom of
> the head-tube.
>
> When I designed each of the 5 frames that I have built, I had the headset
> before I began, and I measured only the lower components. This way I
> knew exactly how much space would be needed to use whichever headset was
> chosen. I'm not certain, but I believe the numbers I came up with were
> not the same as those listed in Sutherland's.
>
> I suspect that if these stack heights are listed somewhere, that they may
> be including the upper components. I do not remember how Sutherland's
> lists them, so I am asking. Anyone?
>
> "Bicycle Mark" Perkins
> Fresno Cycling Club - Historian
> Fresno, California, U.S.A.
>
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