SE50 Aero Polini variator
The polini variator is an instant easy to install upgrade for your scooter. Better acceleration and top speed, finally. Pick up 5-9mph, add a set of gears, and your doing over 50mph. The variator is responsible for the acceleration/change of ratio. The variator contains rollers, which move at a different speed. Pair this with a roller kit, and you can set the transmission up for a light rider, heavy rider, flat ground, or hilly terrain.