The Polini Hi-Speed variator is the safe choice if you want to upgrade to a better and more powerful variator. Thanks to the variator's optimized runways and generally high quality, it will in combination with e.g. a Polini Sport 70ccm, provide a significantly improved traction and help increase top speed. Lev. incl. a set of 6.9gr. 16 X 13 rollers, a set of trim springs and a 22kg compression spring. NOTE: For models with 13mm crankshaft.