The Stage6 Sport Pro variator is developed for use on both standard and Sport cylinder kits. The back of the variator is treated with a product that reduces friction and at the same time also prolongs the life of the rollers. In contrast, the front of the variator has not been treated and therefore the best possible friction between the V-belt and the variator is achieved. The variator is delivered incl. one set 5gr. rollers, two shim disks and a Stage6 "hard" compression spring. The variator uses 16 X 13 rollers. Fits 13 and 16mm crankshaft axles.