Having a smooth pulley is purely to take alot of the shock out of the motors when you impact something andd unless you have it really loose wont make any difference to the speeds your disc can get up to. 720 has the highest top rpm spinner at the moment and that's on a smooth pulley, and Rango has about the fastest spin up time again on a smooth pulley. Its all personal preference but its there to help the rest of the system from shock by adding abit of slip.






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