Knurled Pulley

A knurled drive pulley features a raised pattern machined into the outside of the drive pulley that adds traction when it contacts the carcass of the belt. Straight knurling (lines that run laterally across the drive pulley) allows the belt to wander slightly side-to-side (which is a natural occurrence due to the camber of the belt) without abrading the carcass of the belt.