V-Belt CVT Drive Belt 729 17.7 30 fits GY6 4 stroke 49cc 50cc Long-Case Scooter Motorcycle Belt for the GY6 50cc 139QMB 4-stroke long case engine. Length: 729mm/28.70" Width: 17.7mm/0.70" Angle: 30 degrees No assembly required and can be installed in minutes. Please check pictures/dimensions before the purchase. All MEGA MOTOR Parts are tested and guaranteed to work on arrival!