http://www.specialized.com/us/en/bc/...01&scname=Road
http://pedalforce.com/online/product...902800caa22be3
^ Geometry listings.

As of right now, I own a 54cm 2011 Specialized Allez with a 100mm Stem with the seattube length (including seatpost) at 70cm.

What size stem would I have to transfer to if I went with a 50cm Pedal Force CG1 to have the same sizing as the Allez.
Allez-------------CG1 (50cm)
54.8-------------53cm------top tube length
70---------------71cm------seat tube length (includes seatpost; CG1 is ISP so I cut 1")
14.5-------------11.5cm---head tube length