among inventions of humankind, also it is used the part of every vehicles. The dynamical
principle of wheel is dwindled the wheel's
resistance by changing from sliding friction to
rolling friction when the wheel is moving. The oldest wheel in the world was discovered at the
ruins of Mesopotamia and it might be made in B.C
3500. This wheel looked like a circular plate of
log and it used to be the trolley's wheel. Since
then, the appearance of the spokes wheel was
caused growth of the overland traffic. Moreover,
the Roman Empire and Greece used to the quadrigas which were installed metal tires. At the first time, the materials of wheels was made by lumbers but, as use of metal had grown up, people
employed metal part in the important components.
Continually, the discovery of rubber tire and
rubber wheel have developed rapidly with the
