I suppose it depends on your crotch. If you are short legged and long torsoed, you might like a 55 with a long stem better, otherwise, go for 57. The bike in the picture in the first post has the saddle raised to pedal at a 74 cm height from the BB spindle to the top of the saddle. I'm 1,77 mt., so about one inch shorter than you. It's a 55 size.