well, if these were some measurements (these are for my wife, were both getting bikes this winter, for her im looking at an allez circa 2004) she is right between 52cm and 54cm, so there has to be an adjustment somewhere in stem/toptube, only one of these are not a fixed part of the bike.
http://www.specialized.com/us/en/bc/...8&menuItemId=0
geometry specs
her 'fit calculator'
Seat tube range c-c: 53.4 - 53.9
Seat tube range c-t: 55.0 - 55.5
Top tube length: 53.3 - 53.7
Stem Length: 9.6 - 10.2
BB-Saddle Position: 63.1 - 65.1
Saddle-Handlebar: 52.5 - 53.1
Saddle Setback: 5.2 - 5.6