The issue with the Monster wheels is increased mass with the extra alloy, steel and rubber needed for the wider rim/tyre (it needs to be wider to provide the air volume necessary to maintain the load rating).
This leads to increased inertia which hurts both suspension control (linear inertia) and the other aspects mentioned in the Beetle review (due to the rotational inertia). The fact that almost all of the additional mass is added near the outer circumference increases the rotational inertia more than if it was distributed evenly across the radius.
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