Originally Posted by
fietsbob
I think Fish Man has the right Idea, 4 inches below the shoulder ..
Insertion depth by itself does not make it stronger. In a steel steerer, if the quill expander is tightened securely the depth is almost irrelevant beyond a few inches. Whether it is inserted 1" or 4" it is experiencing the same leverage at the point where it exits the steerer, and that's where it would break.