^ Are you sure you need a 50cm? I'm ~5'7"-5'8" and like a 55cm-ish bike. My girlfriend is ~5'2" and finds herself comfortable on ~48cm. Looks like Seeker333 is about the same height as you and I and said he rides a 56cm. Seems like you'd need at Least a 52cm. I think sizing charts would generally size you ~54-56cm unless you've got short legs and use a longer stem. Or unless you just like a low bar height(below seat height).