If you'd like to explain how you've managed to get around the laws of physics, that would be great. I'm sure others would find it useful.
If you mean that it's negligible in terms of affecting the handling, well maybe to you: Certainly I can feel it, and again why would want to remove weight from where you're trying to create traction?
Do you really think that there would be a noticable difference in handling/weight distribution, from a spare wheel weighing a mere 10.5 Kgs?
I know there is no deterimental affect to handling for me, but I have put a sub and power amp almost in it's place.