Originally Posted by
TenSpeedV2
It isn't just about the seat height, it has to do with the top tube length as well. As a fellow 5'11 1/2" er, I am on a 58. 54 will be very small for you more than likely. For me, even a 56 is pushing it on the small side.
Agree! I am 5'4" and my current bike is setup as an upright townie and has a road bike-like geometry. I got a 54cm and the top tube is 55.5 cm. The reach with the upright bars is perfect for me, and i am way shorter than you. On a road bike, I'd likely take a 52cm and my inseam is about 31.5/ pubic bone height is 80cm. My reach is about 74cm. That sounds tiny to me! You'll be very cramped in the cockpit.
If the top tube is really long it could work. But it would need to be an oddly proportioned bike with a 57cm+ top tube.