This is pretty standard stuff in automobile land. Unsprung weight (includes slightly more stuff than this, but same basics) is known to have a disproportionate

This is pretty standard stuff in automobile land. Unsprung weight (includes slightly more stuff than this, but same basics) is known to have a disproportionate effect relative to, say, the driver gaining a couple lbs. People don't talk about it as much as other performance factors, but this is why magnesium wheels have existed for upper end cars for a while, and carbon-fiber more recently. On the flip side, this is also exactly the same reason why flywheels outside of automobile land, when used as energy storage devices, are hugely massive.