A. A bicycle is a two-wheeled machine that is pedaled by the rider's feet. People
use bikes for hundreds of years. Historians disagree about the invention of the bicycle.
B. Some historians think that Leonardo da Vinci
draw a sketch of a bicycle in 1492.
C. The first two-wheeled rider-propelled machine
invent by Baron Karl von Drais de Sauerbrun of Germany. In 1817 he rode it for 14 km.
D. The frame was made of wood and this bike didn't have pedals. Nowadays there are different kinds of bikes. The mountain bicycle is
it used for riding on rough roads.
E. It has
many than 10 speeds, wide tyres, and strong wheels.