I think it goes like this: If you start from the bottom bracket there are really two vectors that completely determine how a frame fits the rider. One is the vector from the bb to the top of the headtube, and the other vector being from the bb to the top of the seattube. If you keep these two vectors fixed they determine theoretical toptube length. If the bb->st vector changes in magnitude, bounded by the top of the seat lug, you get top-tube slope. Lowering the seatlug along the angle of the bb-st vector results in a sloping top-tube, which has two effects: decreasing the lower bound on of the seatpost adjustment range, and lowering the top-tube on one end. A lower top-tube yields lower standover clearance, and decreasing the lower bound on seatpost adjustment range allows shorter people to ride a given frame. Whether these folks will be comfortable or not, of course, depends on whether they are comfortable with the theoretical tt length, which does not change in this process.
Apologies if that did not make any sense. It's saturday morning and I have no idealwhy I'm up right now. Matt -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To view this discussion on the web visit https://groups.google.com/d/msg/rbw-owners-bunch/-/aIcdPL6uvWUJ. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
