Zack and Spurg dive into the auditory soul of motorcycling and what makes an engine sound "iconic." From the rhythmic clatter of a Ducati dry clutch to the "vicious" scream of an Aprilia V4, we break down the sounds that transports us to the racetrack and the open road.

We also pay tribute to the legendary Japanese industrial designer who survived the atomic bomb to create the iconic Kikkoman soy sauce bottle AND the Yamaha VMAX.

Stick around for a special Engine Sound Guessing Game and a heartfelt discussion on the risks and rewards of putting kids on the back of a motorcycle.

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• Common Tread: News, opinions, and written reviews
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