V-Belt CVT Variable Drive Belt Standard 724 17.5 28 Fits Long Case QMB139 49cc 50cc 4-stroke Scooter Moped ATV V-Belts are made for high mileage and reliability. Oil and heat resistant. BELT SIZE: 724 17.5 28 Fits Vespa ET2 50cc, SYM FIDDLE II 50cc For CVT upgraded SYM scooters and many scooters and Go Karts. Fits Long Case QMB139 49cc 50cc 4-stroke engines Package Includes: 1 x 724 17.5 28 Standard Belt.