Originally Posted by
rpenmanparker
Dean, if you can explain that better, I am happy to reconsider it, but I don't think you have it right. Stack and reach are absolute indicators and once established are not modifed by other measurements. Talking about what the top tube length or seat tube angle or head tube angle are will not increase or decrease the stack and reach. The top tube will have to be 14 mm longer to produce a 4 mm longer reach on a 32 mm higher stack, yes, but the stack and reach stay what they are. And they are all that matter.
As Fiery said due to the reach being measured at the stack height this has to be allowed for when comparing the reach on two different frames with different stack heights. So although the stack/reach idea is an improvement on previous ways of comparing frames they are not independent of each other. Which is basically what you are saying anyway I think?