Secondary transmission Z 16/37 - Piaggio Quartz 50 H2O 2T ('91-'94) / Zip RST Fast Rider 50 AIR 2T ('96-'99) - Polini

Secondary transmission Z 16/37 Polini for the following applications: Piaggio Quartz 50 H2O 2T (1991-1994) / Sfera RST 50 AIR 2T (1995-1998) / Zip Base 50 AIR 2T (1995) / Zip RST 50 AIR 2T (1996-1999) / Zip RST Fast Rider 50 AIR 2T (1996-1999).

- Number of teeth on sprockets: 16/37.