Description A higher gear ratio will increase top speed. Only recommended for tuning / racing cylinders. OEM cylinders usually don't have enough power to pull this kind of transmission.Gear ratio: 13/40 (3.07) => +13.3% Shaft diameter = 17.7mmNote: Piaggio changed their transmissions in 1996. The intermediate shaft between primary and secondary shaft was 18.0mm before 1996 and was changed to 17.7mm after 1996. In case you're not certain - please check the measurements! This transmission is for models after 1996 with 17.7mm shaft. Questions about the product

• Brand: Polini
• SKU: P202.1378
• Availability: In stock

Notes and Safety Scooter gearboxThe transmission of scooters and some mopeds is located in a case behind the clutch and torque driver and has the function of reducing rpm and ultimately driving the wheel axle.The transmission of a scooter has a direct influence on top speed. If the engine develops enough power and torque at low rpm, you can choose a longer gear ratio to achieve a higher top speed without any noticeable loss in acceleration.Please note: if you don't have a press, better choose pre-assembled gears!