| based on physics, Unorthodox's statement that most of the gain comes from weight reduction is wrong. You will see some gain from reducing the weight but not like they claim. The reason they are wrong is that there is only one theory in play when the weight is reduced and the same diameter pulley is retained. When you reduce the distance of the rotational mass from the axis of rotation as it relates to pulleys, there are two theroies in play: 1) the reduced diameter pulley with the same weight will require less torque to spin and 2) the underdriving of the accessories. The theory that I linked to suggest, assuming the stock pulley weighs 6lbs and is 6" in diameter, I could make the same pulley 6lbs in a 5" diameter and it will take less torque to spin than the 6" pulley. That tells me more power is freed up by underdriving rather than weight reduction.
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