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The first motorcycles were little more than bicycles with basic engines strapped onto them. Over time, these "bone shakers" have evolved into powerful, agile vehicles that riders take off-road and race in what have become some of the hottest new extreme sports of the last decade. Young readers will be mesmerized by the colorful images in this exciting new book. Topics include: - the early days of racing - the components of a sport bike, including engine, suspension, brakes, wheels, and tires - Superbikes, Speedway, and Grand Prix racing - motocross and trail bikes - driving gear, such as helmets, gloves, boots, and riding suits - rallying.