Originally Posted by Pete Fagerlin
I've always adjusted the head tube angle on my big bikes by raising or lowering both crowns, or by purchasing a set of crowns that change the head angle (in addition to the raising and lowering).
Yes, moving the triple clamps up and down on the fork tubes is the best way to change or tune head angle.
This technique has been around since before either of us was born.
The possibility of a different point of refference is the one
mechanical block that you have on this.
The other block is that you are now trying to argue simply for the sake of arguing, I think you like it.
Starting with the opposite point of refference actually does make the same theory work in reverse.
Fork height will not change with this, so we either move the frame upwards and cut off the top, or move the frame downwards and cut off the bottom, depending on where we start from, if we are just trying to show that it can be done..
The frame can't hang below the lower crown just as it can not rise above the upper.
Either way, it has to fit in the given area and it will be cut or a smaller headset will be located.
Given that we are discussing a 1/4 or so inch difference, this really is just academic.