Originally Posted by
Kertrek
I'm 5'6" and have a 52cm Specialized Allez. Another shop did some measurements and said I should have a 54cm frame. Since the Allez top tube is arched, is 52cm the best choice. And does 2cm even make a difference?
The arch in the top tube is only an issue on the larger bike if you have really short legs for your height. 54cnm is really on the cusp of being too big for 5'6", unless you have extraordinarily long arms and legs. Especially for Specialized road bikes, which run large for their nominal size. If you're feeling cramped on your 52, look into a longer stem and a little more saddle setback.