Traditionally, the gear ratio in scooter CVTs is changed by the in-and-out rolling movement of the roller weights. With the innovative Dr. Pulley sliding roller weights, the roller weights “slide” inward and outward in the Movable Drive Pulley (MDF) to change/extend the gear ratio.
If you have done the Big Ruckus face "b" mod to your 2001-7 Honda Reflex scooter, then these Dr. Pulley 24 gram sliders are a must to add to your mod. There is no loss of top speed and there is no comparison to the gain in 0 to 55 mph acceleration when leaving the rollers out and install the sliders. It turns the scooter into what it should have been from the factory in the first place.