Originally Posted by StanSeven

You can definitely go smaller and a 57 is too big for you. The lack of seatpost and short stem shows that.

I am a little taller than you and ride 56's. I ordered a fixed gear track bike once in a 56 (Fuji) but didn't know Fuji sized their bikes center to top of seat post so it was more like a 53. I put on a long stem and really raised the seat and it was fine. Actually the bike felt very responsive and quicker even though it probably wasn't. But I understood why the pro's usually go small.