Originally Posted by Kontact

If a 56cm frame with 140mm headtube has the same Reach as a 50cm frame with a 100mm headtube, do they actually have the same useful reach?

If I buy a frame with a particular Reach and install 30mm of spacers, is the reach the same as with no spacers?

Reach, as defined, is only useful if you are going to use the bike with no rise, or if you are comparing bikes with the same stack. Outside of that it is useless number that makes short head tube frames appear to have long reach, since they don't account for the increased set back of the angled seat tube.