Note that in your picture, the seat clamp is facing backwards, as it is on most bikes. On some of the official R&M Birdy photos it is facing forwards. That's a simple trick if you want to reduce the seat-handlebar distance with a few cm, as I did. I have the more forward leaning stem, unlike the backward leaning one on this blue bike. I'm not sure, but it seems to me that black bike also has the backward leaning stem...?