The bicycles or bikes are the most common and healthy way of transport in the world. The bicycle is many people's favourite sports equipment.

Riding a bike gives you the chance to entertain yourself, to exercise and to travel without doing any harm to the environment. The number of bikes in the world exceeds 1 billion. The most common models of bikes are road bikes, mountain bikes, kids' bikes, BMX bikes, light sports bikes with aerodynamic shape.