Originally Posted by Hobbiano

If you're 5-8 with a 30" inseam meaning pants inseam, it should fit well. I'm your size and I set the saddle at 27" from center of crank to top of saddle measured along center line of the seat tube. A 21" or a 54cm size frame fits me about perfect. In the case of a 620 the next size smaller or larger would be 19" on 22.5". While you could ride these, they would not be ideal.
When are you going to get it?