Here was the eBay Q/A discussion:
How did you make this carbon/aluminum frame all carbon? Is it really stiffer than Tarmac SL3 or Cervelo R3?
This frame was always carbon, there is no aluminum in this frame other than the headset possibly. The only thing we did to this frame is sand down the original paint job and have it coated with matte black finish. Through personal experience I can say it is much more stiffer than the Tarmac, and the R3. I've owned the Tarmac and SystemSix at the same time and I feel pedal strokes much more when I am on the SystemSix.
Refer to the link for reviews on the bike and its performance.http://www.roadbikereview.com/cat/lates ... 68crx.aspx
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I am only asking because if it is indeed full carbon....I WANT IT!
It has an aluminum rear end. It's carbon from the middle of the top tube and the middle of the down tube forward. Everything else is basically a CAAD9. Benefit of the doubt, it's painted all black and he just doesn't know. I personally would have a tough time buying from a seller who doesn't know what he's selling. Worst case he knows and is hoping you're an idiot and will believe him.
Cannondale never made any full carbon system six bikes. Never.