It is commonly recognized that eliminating weight from a vehicle will aid it's acceleration. Even greater gains in acceleration, or wheel horsepower, can be made by eliminating weight from rotating parts of the drivetrain and chassis. To even further complicate matters, there are more gains to be made in reducing certain areas of rotating mass than others.
For example: Reducing 10 lbs of weight from parts that rotate at engine speed (crankshaft, flywheel, etc.) will have more benefits than reducing 10 lbs of weight from parts that rotate at axle speed (hub, rotor, wheel/tire, etc.) This somewhat relates to drivetrain loss, which most people are familiar with.
However, even reducing the weight of parts that rotate at axle speed, still far outweighs the benefits of reducing weight from non-rotating parts.
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