Scooter Speedometer Drive Gear For Gy6 49 50 150 Scooter 12mm This speedometer drive gear is designed for use with GY6 engine models commonly found in 49cc, 50cc, and 150cc.It features a 12mm shaft diameter and is engineered to transmit rotational from the wheel hub to the speedometer , enabling accurate speed measurement.The gear mounts directly to the scooter's front fork assembly and interfaces with the speedometer housing to.Compatible with standard 12mm speedometer systems, this component supports proper instrument functionality in small displacement. Important: This product is an aftermarket alternative.Brand names mentioned serve only to show which devices it fits.