It is a fixed half-pulley with diamond machining on the belt running surface and with recalculated angle to further increase the shifting range. This element complements the Multivar and makes it unparalleled. Designed for the scooter variator line, it further improves the working condition of the drive belt. It is not just an accessory, but a very important part for the durability of all transmission components. The temperatures that are produced inside the crankcases where variators with V-belts work at critical times are prohibitive, and sometimes certain parts, such as drive belts and variator rollers, suffer irreparable damage. There are cases where the rollers may reach the melting point. Ventilvar in addition to other advantages has a higher cooling capacity than the original half pulley, a result that makes it indispensable for safe and sporty driving.