No, the lower frames in the range tend to have BSA bb and aluminium steerer fork and possibly less fancy frame - Caad 8 Claris frame is 'Aluminium' 105 version is 'Optimised 6061 Aluminium' - I've no idea of the real world difference. My winter bike is a Synapse Claris frame with 11spd 105 and it's a cracking bike. You can see the specs on the Cannondale site.
No, the lower frames in the range tend to have BSA bb and aluminium steerer fork and possibly less fancy frame - Caad 8 Claris frame is 'Aluminium' 105 version is 'Optimised 6061 Aluminium' - I've no idea of the real world difference. My winter bike is a Synapse Claris frame with 11spd 105 and it's a cracking bike. You can see the specs on the Cannondale site.