Cycling is a boom sport at the moment. The numbers of people active in on-road and off-road cycling continues to grow and sales of products such as turbo trainers that allow enthusiasts to train at home when the weather is inclement are also moving into a higher gear.Here is a story of innovation, German manufacturing excellence, joint ventures and the commercial returns from people's desire to become more active. Electric-powered bicycles (e-bikes) are being built with the help of the multinational firm Daimler Benz. The bikes, which cost as much as $5,000, only help cyclists pedal if they want them to, but their motors can also effortlessly push up drivers to 45 kilo-metres per hour. A luxury product for now, but as economies of scale take effect, prices will fall and the product will become more affordable.