What do you think is the optimal stance width and can you calculate it from your own body dimensions?

By stance width I mean this:



Stance width consists of bottom bracket axle width, crank q-factor, pedals and cleat position.

I would suppose that at least some people could get some relief for knee pain if they had the correct stance width. For example extremely wide stance width could put some unwanted pressure to knees, as well as way too narrow. Wrong stance width could also lead to some loss of power.