The speedo drive, also known as the speedometer drive, is a mechanical or electronic component that transmits rotational motion from the motorcycle's front wheel or transmission to the speedometer. It typically consists of a gear or sensor that is connected to the wheel hub or the transmission output shaft. As the wheel turns, the speedo drive converts this motion into a signal or movement that is sent to the speedometer, allowing it to display the motorcycle’s current speed. Proper functioning of the speedo drive is crucial for accurate speed readings and overall reliable performance of the motorcycle’s instrumentation.