Anybody agree with my assertion that the wheels on your car are akin to your flywheel? Heavier flywheels/wheels=more momentum, steadier acceleration, better for uphills? etc. etc. And a lighter flywheel/wheel means faster revs/acceleration but less smooth and not so good for when you hit small inclines?

 

Unsprung rotational mass versus pre-transmission sprung mass. Not a similar comparison, to be honest.

 

It's much easier to go up hills with light weight wheels, however, heavier wheels will hold highway momentum ever so slightly longer

 

Lighter wheels means less mass to get rotating. But the flywheels directly affects the engine. A moderately heavy flywheel will keep the engine spinning better but slows engine response. Light wheels however, are better in almost every way.