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celek: only losses in friction of gears/bearings and tire-road affect whp readings. And those are mostly same with or without lightened rotational components. Change of rotational mass affect only time at which certain speed is reached, not how much energy is needed once it gets up at said speed. In your example if you move it to dyno, then it's not the wheel of 200lb or 50lb weight, but rather that dyno brakes car wheels at four time the force, which is not the case. With same dyno "braking" readings should be same for both 200lb & 50lb wheels, with exception of how long heavier one was spun up/accelerated to max speed.
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