A fixed half-pulley with increased, recalculated ventilation and surface treatment to prevent wear and friction. This element completes the Multivar variable-speed drive leaving it without rivals. Specially designed for the line of variable-speed drives for scooters, it further improves the performance of the drive belt. It is not just a simple accessory, but a very important part for guaranteeing the long life of all the transmission components. NB: can be assembled with Multivar and original variator