Originally Posted by Pete Fagerlin
Next, facing the head tube, or adding material to the head tube (virtually, as in installing a headset, or headset spacers) does not change the head angle.
I'm having trouble picturing how this is. It was my assumption, that (for the sake of example) you had a headset w/ a lower stack height of 2 in. Wouldn't the front end feel much higher than if you were running a headset w/ a lower stack height of 15 mm? Isn't adding/taking away from the lower stack height, going to have the same effect as playing around w/ the A to C height of the fork? Thus changing the head angle?
Now, that is only when playing with the lower stack height. If anything is added/subtracted to the upper stack height, yeah, head angle is not going to be affected.