Van Nicholas website recommended 50cm, But the 54cm feels right.
I inputted my vital stats into VN frame sizing section on their site. And at 5'7" with my slightly short inseam and longer torso I got a 50cm advisory frame size. When I went to my LBS they had a 54cm in stock that I could demo, then order a 50cm if I liked it etc.
I felt right at home on the 54cm to be honest and am a bit concerned the 50 or even 52cm might be a bit undersized. Should you go for what you feel comfy on or on recommendations from the maker?
The thing that's harder to fathom is that 54cm isn't the actual measurement, it must be an effective sizing due to sloping top tube, so I can't really tell whether VN frames just come up small? I bought a Genesis Croix de Fer in 52cm as the 54cm felt too big height and length wise. This Ti bike (ventus model) feels much more like the 52cm Genesis in terms of stretch etc.
Bit baffled as there doesn't seem to be a concrete way of gauging height comparatively between manufacturers. One persons 54cm might not be another if that makes sense?