Polini reinforced transmission cover, ideal for tuning above 70cc. The standard cover allows the gearshaft to sit in a recess and is only lubricated by the gearbox oil. This item has a ball bearing and needle bearing set up and massively reduces the amount of friction. The following bearings are fitted to the transmission cover: Suitable for Piaggio engines with original transmission or with taller gearing and 16mm gear shafts