The POLINI HI SPEED 12 roller dimmer is a very powerful model for a relatively low price! It allows you to simply equip your scooter without needing any other part! Its model cheek is made of a special alloy allowing lightness low wear, robustness ... The angle is reviewed in order to make the most of the entire speed range, the top speed gain is also present thanks to a larger range exploited! The tread (rollers) is also revised so that the closure is more longitudinal and efficient. This cheek is special and very studied, the proof still by its passage barrel mounted on joint spy in order to be able to grease, to avoid seizures ... POLINI gives you this variator with 1 set of rollers to better exploit your engine. The performance gain will be present level acceleration speed range and top speed ... This version 12 rollers offers a very good support flat! The drive works better! Mounts on KYMCO XCITING / X CITING / X-CITING 400 from 2012 only!