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Give this a quick read: http://www.cervelo.com/en/engineering/thinking-and-processes/geometry-and-fit.html
Compare stack and reach of your current ride (or anything you've ridden or know of). There are stack and reach calculators but they are a bit dodgy; I generally put dimensions in BikeCAD; it now calculates stack and reach based on traditional published geometry.
Compared to a standard 56cm frame this would need a 15cm-ish to fit.
Confused on the sizing for this, but interested.
what height would this suit? the same as a 56cm traditional geo cross bike?