Hello,

I have been cycling for over thirty years mainly mountain biking and biking.
I ride my work bike a lot. It's a completely modified Urban focus.
Only the frame is original !
Over time I completely adapted it to my dimensions but it has a cross country MTB cockpit.
I have always loved building my own bikes. I feel comfortable on this bike.
It is comfortable, handy and I can ride for long periods of time. 3 hours and more.
I easily go out for more than 90 km rides. I would like to get a road bike.
For my fortieth birthday, my wife decided to offer me a road bike with a custom titanium frame.
I'm looking to have a multi-purpose, high-performance and reliable bike built that I could keep for several years.
If I have always cycled, I have never had a road bike and I have no reference to define my ideal bike geometry. I would like to do a postural study to be sure of being comfortable and to define the dimensions of the frame of my future bike.

I am an industrial designer and I was trained in ergonomic study.
In my opinion, the objective of a postural study is to define the position that offers the best compromise between comfort and performance for a given period of time.
My understanding of postural study for a bicycle is to define the position of a human body in movement, effort and support.
There are several points of support in space.
To define the dimensions of a custom-made bicycle frame, these coordinates must be crossed in space with:

- The technical constraints of a bicycle (wheel arches, head tube angle and so on.
- The characteristics that we want to give to the bike and which have an impact on the geometry of the frame
- The dimensions of the equipment - length of cranks, saddle, seatpost, stem, dimensions of the fork etc.)

If it is easier to start from an existing bike geometry, it is possible to define the ideal dimensions for a cyclist just starting from his feelings.

There is a store in my area which offers postural studies (the retul system) but do not want to carry out the study without an existing bike to integrate the parameters.
I could pick a bike geometry on the frame builder website. and give them to the bike fitter.
I fell a bit stuck.
I would have liked to have your point of view and to know how I could solve this problem in order to be able to build my bike while being sure of the dimensions