Hi, I am a frame builder / geometry knowledgeable sort of fellow. I would recommend staying away from those technicalities. I recommend that you focus on A) preferred reach I.E. the distance from the saddle nose to the handlebar center. And B) How much Higher/ lower you prefer that your handlebars are in comparison to your seat (using a level) Or you can measure your seat height from the ground and to handlebars, and come to a conclusion. For instance I have five bikes and It really works for me to have a preferred reach of 19.25" On my touring bikes, I have the handlebars even with the seat height and with some of my dedicated road bikes, I prefer to have the handlebars 1-1/4 " lower. I do worry about reach achieved on a frame that I am building, but only really because my feet were really broken in 2006, and I have to worry about building a bike that will end up with my knees hitting the shifters or handlebars. The general public/you should not worry about these things, you have normal feet. Hope this helps.