Primary gears -POLINI- Piaggio 50 (from 1998) - 14 / 39 = 1:2.78

Only suitable for vehicles with 17.7 mm shaft and support bearing in the variator cover.
If in doubt, please check before ordering.

Extending the gear ratio makes sense if the engine power has been increased by successful tuning measures. With the extended gear ratio, you can convert your extra power into more speed.
In addition, the cylinders and the rest of the engine are protected, as they no longer have to be revved up as much.
In series engines, a longer gear ratio is generally not advisable, as the power is not sufficient in most cases to convert the extra gear ratio into top speed.