Originally Posted by
wcalaker
Another thing to check if you are running on carpet are the pulleys. You can pick up a lot of fibers in the pulleys and it can clump up and in some cases cause your belt to skip. Clean with an exacto blade between races.
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Its amazing how much this can effect how free the drive train is. As carpet fibers get stuck to the pulleys, the pulley diameter increases, tightening your belt and eventually causing a skip as it fills in the teeth.