Originally Posted by
Dean V
Due to the way it is measured a frame with 32mm higher stack will actually have a top tube length 10mm longer if the reach measured the same. So if it is +4mm reach it is actually +14mm when combined with the +32mm stack.
The Cervelo website explains stack and reach fairly well. Have a look at that and you will see how it works.
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.