I ride a 2010 Specialized Roubaix Expert and while I haven't tried, I really don't think it'd fit in my Z.
It fits just fine in my XTerra 4x4 Off-Road, though
I don't even have to take the wheels off!
The Z has a good amount of room... for a sports car. I have to remove the driver and fairway metals from my golf bag to get the bag in the hatch, and then lay them diagonally across the hatch (and they barely fit).
A case of wine will fit in the hatch pushed up towards the seats, but because of the slope of the rear glass, it's too tall to fit in the hatch closer to the rear of the car.
If I didn't have another vehicle to transport bigger stuff in, I probably would've bought an STI with a roof rack instead of the Z.
Nice Ducati, BTW. I ride a 2011 Speed Triple. Maybe I'll see you out on Palomar!