is that the PDF from RBR? sure, would be good to have a look. checked out this earlier today : http://www.cyclemetrics.com/Pages/Do...t_formulas.htm and at the base it gives the equation ( (Torso Length + Arm Length) / 2) + 4 = ( Top Tube + Stem) . this is all good and fine, but what is torso length exactly ( i know what a torso is!!) is it from my hips to the top of my shoulders?