Riding a bike is good: it keeps the heart and arteries in shape, reduces the risks on the joints to a minimum, and allows you to stay in contact with nature. Nowadays, the market offers a wide range of “disciplines”: city-bikes, cross-country and downhill mountain-bikes, racing and triathlon bikes, road bikes and many others. The main criteria of choice is the commitment that one thinks of dedicating them. With two thin wheels, the racing bike is only to be used on the road while mountain-bikes dominate in the woods and on rough terrain. A good compromise between comfort, sporting practice and opportunities of use is the city bike, that is suitable for the road and forest paths.