Tom, The standard measurement these days by more and more frame makers is called the reach, along with the stack. Riv has recently added these to their geometry chart and can reveal how deceptive TT alone can be, let alone any 1 certain measurement by itself.
All of the numbers are meant as a guide of course, as every body is unique, some more/less flexible and feel best in this or that position...not what someone else tells them is best for them. There are many articles explaining it, here's one ... https://velovoice.blogspot.com/2015/05/bike-sizing-stack-and-reach.html -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.