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It's all about reducing mass and hence inertia. The lighter weight pulley doesn't add h.p. or even free up h.p. A lighter weight spinning object takes less time to get spun up to a speed, and less time to get slowed down. So, you'll notice better throttle response with lighter parts. You'll notice a bigger improvement from a lighter flywheel because the mass is farther from the crank centerline. Reducing the mass will allow you to build rpm's faster and, hence, accelerate faster without adding h.p. The same principle applies to reducing the rotating mass in your wheels, brakes and hubs when you consider the acceleration and deceleration of a vehicle on a track. +14cc
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