It´s enough because there is a fixed proportion with other measures in the top part of the body (trunk
). I tried to simplify it the most i could. With 2 measures you can fit your bike very well. I have a more complicated spreadsheet considering trunk length, frame angles and the height of your shoes and pedals, but it´s a matter of few milimiters, so i decided to publish the easiest one.
Just fit your bike according to the s.s. and feel the difference, then you can do minor adjustments (no more than 1 mm everytime), till you feel completely ok.
For example, i calculated "the best stem lenght" as an aproach, for setback or non setback seatpost (mtb-road). It´s not very accurate, because i haven´t considered frame angles, but you will find that your best stem length is exactly what i suggest.
The correct procedure is this one. (if you have the right frameset size or at least not very wrong)
1.- Fit your saddle height
2.- Fit your saddle-b.bracket setback ´
3.- Fit your saddle nose- handlebar axis lenght, and choose your best stem length according to your top tube length.
4.- Fit your saddle - handlebar height.
That´s all. I´m not a newbie and this is not just another internet fake, i´m engineer and cyclist till 1990, give me a chance and your body will thank it to you
Biomechanical spreadsheet. Sizing&Fitting.http://weightweenies.starbike.com/forum ... 8e319d185b