As Poly says. In my layman's terms: If a component is a given diameter the part that has nearly all of its weight at the outer circumference (such as a tire) will have more effect than a part with the weight concentrated near its centerline (such as an axle shaft). Exactly the same as a chassis. If the weight is close to the CG it will rotate with less input than one with all the weight at the ends. How much better? Testing will tell.
Doug