Originally Posted by
dougpgreen
I think the takeway is that sizing advice given based on personal experience needs to come from the same model, not just the same series.
exactly. I had spare time last night and checked. There are definitely 3 different geometries. Sirrus X 2.0 and 3.0 share the geometry, Sirrus X 4.0, and Sirrus X 5.0 and 6.0.