Dr. Pulley Sliding Weights 21x17: Vespa GTS, GTV & Piaggio

Next-Gen CVT Performance: Dr. Pulley 21x17 Sliding Weights

Elevate your riding experience with Dr. Pulley Sliding Roller Weights. Unlike standard round weights that roll, these patented sliders use a unique wedge shape to optimize your variator's range of motion. This design provides a lower starting gear for explosive take-offs and a higher final gear for increased top speeds and lower cruising RPMs.

The Dr. Pulley Advantage

• Sliding Motion: Eliminates the "flat-spotting" common in traditional rollers, significantly extending the life of your transmission components.
• Performance Tuning: Allows the variator to open further and close more tightly than stock rollers.
• Self-Lubricating Material: Made from a high-tech nylon compound that reduces friction and heat within the drive pulley.

Engine Compatibility: Leader vs. Quasar

The 21x17mm size is the standard specification for Piaggio's high-displacement engine families:

• Piaggio LEADER (200cc): Found in the Vespa GT 200 and Piaggio BV 200. While smaller 125/150cc Leader engines often use 19x17mm, this 21x17mm size is the standard for the 200cc variant.
• Piaggio QUASAR (250cc - 300cc): This is the default roller size for the 244cc and 278cc engines used in the Vespa GTS 250 and GTS 300. Using Dr. Pulley Sliders in Quasar engines is the most effective way to reduce "belt slap" and improve highway cruising smoothness.

Model Fitment

These 21x17mm weights are a precision fit for the following scooters:

Technical Specifications

• Dimensions: 21mm (Diameter) x 17mm (Width)
• Quantity: Set of 6 Sliders
• Available Weights: 9g, 9.5g, 10g, 10.5g, 11g, 11.5g, 12g, 12.5g, 13g
• Manufacturer: Dr. Pulley (Taiwan) - ISO 9001 Certified

Tuning Advice: For the best results, select a weight that is 10-15% lighter than your current stock roller weights (e.g., if you have 11g stock rollers, try 10g or 9.5g sliders) to achieve better acceleration without losing top speed.

About Dr. Pulley:  Dr. Pulley is recognized as the global leader in aftermarket performance CVT components for a wide range of popular scooter brands, such as Honda, Yamaha, Genuine, Vespa, SYM, Lance, KYMCO, and GY6/QMB powered scooters.  Established in 1987, the company adheres to stringent quality standards and holds ISO 9001 certification. 

Made in Taiwan