Hello list, I have followed the thread and It seems that the only way to prevent variables (tire size, headset stack ect.)in measurement is to measure from the bb center line to theoretic axle possition. Measured along frame centerline. Doe's anyone measure the seat tube length using a vertical line from the ground?
David Cowie Sutherlin, Oregon 95ยบ
Richard M Sachs wrote:
> postscript to prev reply...
> how different is this issue from when angles are speced
> and then folks 1)switch forks or headsets or 2) have unequal
> tire types and air pressures front to back. these would skew
> any angles from their blueprinted numbers. what's the point
> of measuring an intersection between the top and seat tube
> if you can't guaranty the frame is level?
> blueprinted chainstay specs don't have to equal the results
> you get with your tapemeasure on your assembled bicycle.
> e-RICHIE
> chester, ct
>
> On Thu, 12 Aug 2004 11:45:47 -0400 Richard M Sachs
> <richardsachs@juno.com> writes:
> > snipped:
> > "What is the value of measuring parallel to the ground?"
> >
> >
> > you can measure it anyway you want, but before it's measured,
> > it's made. typically, the blueprints and fixture setups are
> > oriented in a 2D format. for as many order forms that use
> > this same schematic as casati - mine does, too - others use
> > lines that are on the ground, emanating from the bb point to
> > the rear axle point.
> > e-RICHIE
> > chester, ct