That's what I thought, but i sent bikemeister2000 pictures and he reckons it's a 16". I'm going with an 18" because of the c2t measurement. In which case, I'm 5'4, and it's just a bit too big.
Because of the gauge of the tubes, I would have thought that the top tube and down tube would merge at the headstock, similar to my m2 Stumpjumper which is a 15.5".
Just been out and done a 25 mile ride on it and had to stop several times to move the seat, in an attempt to find a comfortable position. My weight feels like it's too far forwards on the bike.
The ride quality of it is like nothing I've ridden before, so supple. But it's going to have to go.