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Originally Posted by Angel
A pulley can certainly mess up a crank.... if it isn't balanced correctly or if the stock pulley acts as a harmonic dampener.... which many of them do. Unless you are sure that these two things are either addressed or not an issue on your paticular application, then stay away as it isn't worth the small gain.
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1) These aren't crank pulleys, they are for the accessories.
2) SR's don't have Dampeners.