Not sure if you are asking about equipment spec or geo but if The latter it is a slightly taller head tube (+10mm), and slightly shorter top tube (53.5 vs 54.5cm in a 54). Not sure what you are referring to by 44 inch. Usually these bikes are measured in metric, the equivalent in inches for the above size being a 22". Those may be old numbers though, best to go to the Cannondale site and check the geometry charts.