Clutch gear with 22 teeth for Vespa PX 80 / 125 clutch.
This primary gear is often swapped with the original 20-tooth gear when using a DR 135 or Malossi 139 to extend the transmission ratio with minimal effort and significantly increase the top speed.
The 68T clutch gear on the secondary shaft does not need to be replaced.
Check the RPM calculator to see how the top speed will change specifically.
