The roar of a wide-open throttle, the robust, throaty growl of a big V-twin, the thrumpy exhaust notes of a vintage classic—just some of the motorcycle sounds that have entertained petrol heads all around the world for as long as motorcycles have existed. Whether it’s the engine noise, the gears shifting, the tire-pavement interactions, body vibrations, or maybe even some familiar rattling, motorcycles produce sound when they move. Even the pitch and volume of an electric bike’s gear set makes a faint mechanical whine which escalates with speed.