then chop that pizza slice into small blocks, then measure that small block from the distance to the center, and that will be the inertia of that small volume of weight. Then you multiply by the perimeter that small block, do the same for all the other blocks and add it all up.

the wheel varies in metal mass from center to edge of rim. And wheels are all different. Assuming the wheel is one mass of a radius will provide the largest flaw in the calculation.

Here's an experiment. Grab bicycle wheel, fill tire tube with water and see how much torque (arm muscle on inverted bicycle) it takes to rotate. Now, take that tube filled with water, and wrap it in the center of the spoke - then try to spin again. easier huh :)

That's why two identical cars with different wheels can provide different dyno numbers even though the wheel weights are the same.

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Mk1 A4 - by BSK
Mk1 TT - by QuietsTTorm