BENELLI Primary Driven Gears for Vespa Smallframe Models – high-quality Drive Sprockets for fine-tuning straight-toothed primary gear ratios.
Since the 1980s, Stefano BENELLI has been passionate about all kinds of gasoline-powered vehicles, whether two- or four-wheeled. This passion was particularly strong for 2-stroke engines and, of course, for the Vespa. He gained his first tuning experience here, and his modifications were already being raced in the earliest Italian drag races. Soon, the original design of the Vespa transmission was overwhelmed by the increased power.
- High-quality Primary Driven Gears for Vespa small-frame models
- Easy gear ratio adjustment via the small Primary Driven Gear
- Fine gradation for different tuning levels
- Compatible with primary gear ratios from various manufacturers
Even back when only a short 4th gear was available for Vespa small-frame models in Germany, the Italian racing elite was already using transmission components from Stefano BENELLI. In recent years, more and more transmission manufacturers have entered the market. Outside of Italy, however, BENELLI’s products were hard to come by and known only to a small circle of people. Yet his products enjoy a very good reputation.
In material tests conducted in Germany, his Gear Cogs ranked among the best. Today, BENELLI is a small manufacturer that produces mechanical components for a wide variety of applications using the finest materials. These components are successfully used in motocross, circuit, and drag racing.
Easily Adjust the Gear Ratio
Replacing the Primary Driven Gear on the Crankshaft is an effective and simple way to change the gear ratio. The basis for this is a straight-toothed primary gear ratio. Thanks to the fine gradation of the small primary sprockets, this can be perfectly tuned to any tuning level.
BENELLI Gear Cogs are of very high quality, heat-treated, and made from special steel.
Choosing the right primary gear ratio depends on various factors: the engine’s rated speed, the gear cog ratio of the transmission gears, the intended use, and the circumference of the rear wheel. The primary gear ratio is determined by the ratio of the small Primary Driven Gear to the large Primary Driven Gear. For example, a 72/24 primary has a ratio of 3.00. The larger the number—that is, the quotient—the shorter the ratio.
BENELLI’s Primary Driven Gears for Vespa Smallframe Models are designed to match the specified gear ratio and are compatible with primary gear ratios from other manufacturers.
Technical Details
- Base: straight-toothed primary gear
- Material: special steel
- Finish: heat-treated
- Compatibility: Suitable for the specified gear ratios
- Compatible with: primary gear sets from other manufacturers
Variants
- For 24/72 primary: 25, 23, 22
- For 27/69 primary: 28, 26, 25
Conclusion: Once a primary gear set is installed, it can be quickly and easily fine-tuned using individual Drive Sprockets.
These products are a perfect fit – SIP TIPS:
- Order the matching primary gear ratio from RMS, SURFLEX, CRIMAZ, or DRT at the same time
