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March 12, 2018, 10:39 a.m. -  Andrew Major

I'm not sure what you're biting on. Maybe I could have phrased the original sentence better in the piece. You're correct, that's the definition of Stack and it's a standard measurement but it's a variable dimension (for example a taller headtube will result in a larger Stack height) Since Reach is measured in relation to Stack (at the top middle point of the head tube) a bike with a big Stack number and the same Reach number will have a significantly longer front-center than a bike with the same Reach number and a short stack height.  So if company X has a 500mm Reach and a 650mm Stack that bike will fit significantly larger than company Y's bike with a 500mm Reach and a 600mm Stack.

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