Polini Primary Transmission Gear Kit for 125cc – 150cc Piaggio and Vespa Scooters (Leader Engine)COMPATIBILITY: Aprilia – Atlantic 125/200 4T L/CBenelli – Adiva 125/150 4T A/CDerbi – Boulevard 125/150 4T A/CGilera – DNA 125 4T L/C, Runner VX 125 4T L/CItaljet – Jet Set 125/150 4T A/C, Torpedo (Leader) 125/150 4T A/CPiaggio – Liberty (Leader) 125/150 4T A/C, Liberty LE 150 4T A/C, Skipper (Leader) 125/150 4 A/C, X8 125 4T L/C, X9 125 4T L/C, Xevo 125 4T L/C, Zip (Leader) 125 4T L/CVespa – ET4 (Leader) 125/150 4T A/C, GT 125 4T L/CPolini taller gear kit 17/44 gear ratio get you a higher top speed with less RPMs. **NOTE: DELIVERY MAY TAKE UP TO 2-3 WEEKS****