A Timeless '74 Moto Guzzi Police Bike Gets More Power - Motors Blog

The motorcycle's siren operates by friction from the tire. As the siren spins, it makes a “growly noise.”

A Timeless '74 Moto Guzzi Police Bike Gets More Power - Motors Blog

A Timeless '74 Moto Guzzi Police Bike Gets More Power - Motors Blog

A Museum-Quality 1998 Moto Guzzi Centauro - Motors Blog

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A Timeless '74 Moto Guzzi Police Bike Gets More Power - Motors Blog