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You just increased the reach. 20 mm more seat post set back means the top tube should be 20 mm shorter to give the same position...
drøn-
No, you are not right.
Let me rephrase: Yes but she has no pref in terms of bike fit. this just means she will sit further over bb which will be fine.For me stack and reach are not important. I never used bike cad and I have never bought a new frame and had the measurements as ref for other bikes. I am looking at the relationship between your position of the saddle and bars. And for Kirstine (my partner) I'd like her to get the same experience as I have with my bikes: sitting quite forward over the bb and having a long stem, steep head tube and low trail.
I am not sure if you can read numbers on this screen shot, but reach is as you say 20mm longer but I am looking at where her stem is in relation to where the saddle will be mounted.
Hulsroy
Fixed it. 75 seat tube rather than 73. Might mean longer stem or setback seat post depending how she likes it.
I do like it when seat tube and head tube are same angle, but what can you do?!