How do I slope the toptube with an effective seattube length of 58 c-c. When I set the slope on the toptube it changes the headtube length. Is it possible to change that so it alters the seattube length?
Bicycle Design Software
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In BikeCAD, seat tube length is always a driving dimension. Although you do have the choice of whether to drive seat tube length by a center to center measurement or by a center to top measurement, you currently cannot drive it by effective seat tube length.
To understand how the top tube/ seat tube connection point can be controlled, I recommend watching the following video tutorials:
bikecad.ca/step_through_frame
bikecad.ca/toptube_frontcenter
bikecad.ca/tube_extension