<font face="Arial, Verdana">These are no host settings!</font>
<font face="Arial, Verdana">#if !defined(ROD_RADIUS) && DRIVE_SYSTEM == DELTA</font>
<font face="Arial, Verdana">#define ROD_RADIUS (PRINTER_RADIUS-END_EFFECTOR_HORIZONTAL_OFFSET-CARRIAGE_HORIZONTAL_OFFSET)</font>
<font face="Arial, Verdana">#endif</font>
So if you define ROD_RADIUS the offset is not needed.
DELTA_MAX_RADIUS is the radius your effector should not leave for safety etc. has no influence on computations it self.
PRINTER_RADIUS is just a helper to calculate ROD_RADIUS if not set.