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Without spending too much time on it, I disagree with the positive effects of heavier wheel mass; from wiki:
As mentioned above, there is a positive effect of unsprung mass. High frequency road irregularities, such as the gravel in an asphalt or concrete road surface, are isolated from the body more completely because the tires and springs act as separate filter stages, with the unsprung weight tending to uncouple them. Likewise, sound and vibration isolation is improved (at the expense of handling), in production automobiles, by the use of rubber bushings between the frame and suspension, by any flexibility in the frame or body work, and by the flexibility of the seats.
Unless the road irregularites are loose objects that can be displaced by the tire, when the mass would be relevent, otherwise all forces - 'road irregularities' - are immovable (ie. potholes, speed bumps are FIXED and effectively immovable vs. the car).
Thus wheel mass has no effect on road comfort wrt road irregularities. (excluding effects on handling etc.)
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