A couple people on here have mentioned density. Can someone explain to me why density matters and not just mass? It doesn't matter how dense something is. For this example it only matters what it's mass is. Isn't it like that old kids game....Which is heavier a 1lb of bricks or a 1lb of feathers? At the end of the day it's the mass that affects the rotation right? Sorry if that is a stupid question. I'm obviously not an engineer.
Taking the "stick" example someone else mentioned I have another question. If 2 sticks are 13.365 inches long and 1 stick has an extra 2 lbs attached to the last 3 inches wouldn't that stick have greater "I", or inertia and be more difficult to rotate and/or stop rotation? Please don't answer with sidewall stiffness, lap times, predictable behavior of at the limit adhesion, etc. I understand all that, don't necessarily disagree, but quite frankly don't care.
This is a street setup on a car that is not my daily driver. I drive my Escalade during the week and race a 125cc Tony Kart on weekends. Other than practicing my heel-toe downshifting I don't race my M3 on the streets. My stock wheels/tires will be used for track duty. I'm merely just trying to satisfy a curiousity. Thanks.