Nice Monster 821 in red with bar end mirrors. New battery and tires. 25+ Years of Monster... The Monster 821 pays homage to the legacy of the Monster 900, which over 25 years ago revolutionized the motorcycle world, embodying the essence of true naked sport. Simple and sporty, agile and powerful, the Monster 821 combines perfect performance and ease of riding. With its supremely sporty performance and agility, the new Monster 821 has been designed for maximum riding pleasure. The performance of the 109 HP Testastretta 11 degree engine is enhanced by the Ducati Safety Pack, ABS and Ducati Traction Control, and the Riding Modes.