A bicycle is a vehicle with two wheels. A person sits on the seat. You hold the handlebars to steer the bicycle. You put your feet on the pedals to move. The pedals turn the wheels. A chain connects the pedals to the back wheel. The frame is the main part of the bicycle. All the other parts connect to the frame. A bicycle also has brakes to stop. It is a simple machine for transportation. The wheels have tires, which are made of rubber.