Doesn't Cd consider area though? Because motorcycles are comparatively small it doesn't take much drag to bring the Cd figure up pretty high. The total drag though is the number to watch.
Interesting article on sportbike aerodynamics. Note that airspeed is 62mph.
Sport Rider-Testing Suzuki Hayabusa and Kawasaki ZX-12R aerodynamics in the wind tunnel
"Eight years ago, when Kawasaki engineers were designing the original replacement for the ZX-11, the prototype resulting from wind tunnel testing was almost a carbon copy of the Hayabusa--only the company figured it was too ugly to sell. And a Kawasaki engineer has confirmed the ZX-12R was in fact "neutered" to a lower top speed in its final stages of development. "
I hope we can redefine what is "ugly" and not "neuter" our motorcycles so that they can become aerodynamic.