Originally Posted by 2Rodies
OK I've done some research. The Robaix is a not a direct comparison to the CAAD8 it's more in line with the Synapse. To compare apples to apples you would have to use the Tarmac v CAAD8. In a '54' (the nearest is the Tarmac w/548mm top tube CAAD8 546mm top tube). The Tarmac has 130mm head tube while the CAAD8 has a 145mm top tube.
I wasn't trying to do a direct comparison at all, but to show the widest possible difference between two very divergent frame designs that would put the rider in two different positions. Roubaix vs. CAAD8 (R1000/R3000) as an example of two bikes in the same price category that an LBS might recommend to somebody 40+ with money to spend.
However I have seen Roubaixes set up in low-profile 'race' positions, with a low profile headset and no spacers. This one is owned by a guy from weight weenies:
