Dr. Pulley 21x17 Sliding Roller Weights: Vespa & Piaggio

Unleash Your Engine: Dr. Pulley 21x17 Sliders

Transform your scooter's power delivery with Dr. Pulley Sliding Roller Weights. Unlike standard round rollers that can develop flat spots and limit your gear range, Dr. Pulley’s patented sliding shape allows the variator to open more fully. This results in a higher top speed and faster off-the-line acceleration by allowing the belt to sit lower in the "low gear" position and higher in the "high gear" position than traditional rollers allow.

Technical Performance Features

• Patented Anti-Flat Spot Design: The non-round geometry eliminates the uneven wear and "notching" common with circular weights, ensuring consistent shifting over thousands of miles.
• Broader Gear Ratio: Allows the variator to retract and extend further than OEM specs, providing a "best of both worlds" upgrade for both takeoff and cruising.
• Self-Lubricating SL9 Material: Composed of a high-tech, low-friction nylon composite that resists heat buildup and reduces internal variator wear.
• Precision Tuning: Available in weights from 9g to 13g to perfectly match your specific modifications, whether you're looking for better hill climbing or maximum top speed.

Comprehensive Fitment Guide

These 21x17mm weights are a direct performance upgrade for Vespa and Piaggio 250cc–300cc models:

Technical Specifications

• Dimensions: 21mm (Diameter) x 17mm (Width)
• Quantity: Set of 6 Sliders
• Certification: ISO 9001 Certified
• Manufacturer: Dr. Pulley (Taiwan)

Mechanic's Note: The 21x17mm size is the standard for the larger Piaggio engine blocks. Installation Warning: Dr. Pulley weights are directional. Ensure the side with the "closed" face is pointing toward the direction of the variator's rotation to avoid damage. Tuning Tip: For the best results, select a weight that is 10–15% lighter than your stock rollers to achieve better acceleration without sacrificing top speed.

SKU: SR2117
Vendor: Dr. 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.

Detailed Model Fitment

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