Dr. Pulley 20x12 Sliding Roller Weights: Yamaha, Kymco Options:9.5 G VBB (All Series) Vespa GS

VBB (All Series) Vespa GS GS150 (VS1-5)

Sidewall Style: Factory-molded whitewall

Large Plate: 121mm OD / 70mm ID

and bikes running 139QMB engines

Unlimited Rev-Limiter: Removes the factory ceiling for higher top speeds

Dr. Pulley 20x12 Sliding Roller Weights: Yamaha, Kymco Options:9.5 G VBB (All Series) Vespa GSUnlock the full gear range your CVT was designed for. Dr. Pulley 20x12mm Sliding Weights replace the flat spotting round rollers in your variator with a patented non round geometry that lets the variator retract further for a lower starting ratio and extend further for a higher top speed ratio delivering faster launches and lower cruising RPMs without touching your belt or variator. Choose your gram weight to dial in exactly the performance character