Originally Posted by
DaveSSS
Most road bike frames come with a matching fork. Since stack and reach are measured from the center of the bottom bracket, a fork change does nothing to alter those values. If a different fork length were used it would change the steering geometry and slightly change the BB height, but that does not change stack and reach values. Stack and reach are not relative to the ground.
You didn't click the link in post #57 above, did you?
Dan Empfield, the originator of stack and reach, agrees with me, not you.