Originally Posted by
Regulatori
I... Cipo Saeco Cannondale, ...
You are on the right track. A CAAD4 or CAAD5 should work. He is my 2000 CAAD4:
Cannondale made the switch from a 1" to a 1-1/8" head tube and fork steerer for MY 2001. Mine being a 2000, I got the former, which requires a shim to use a modern stem, so I agree with
cyclezen that it would be preferable to get a 1-1/8" one, but many sellers do not have that information.