Ages 7 to 14 years. 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 mesmerised by Superbikes, Speedway, and Grand Prix racing; motocross and trail bikes; and rallying.