The story of the invention of the wheel began when the primitive people suddenly noticed that circular objects are much easier to move if not carry them. Subsequently, observations of rotating bodies and their properties led to the appearance of the prototype of the first wheel in XV century. BC. It was log-rollers, which were placed under heavy boats, tree trunks or other weights needed to be moved over long distances.

The method with the levers was not very convenient: logs close to the levers periodically released from the load, and all of them constantly had to be carried forward. There was a need to fix them. And here came the idea to fix logs with each other, to attach two more pairs of smoothly cramped logs at the bottom, and between them - the third - smooth, larger diameter and free. So the cart appeared, it moved well, and it was not necessary to push it with levers, for this purpose it was enough effort of hands. This was the prototype of the wheel.

Later on, it was noticed that the roller with a thinner middle than the edges, moved more evenly, it was less swept aside. With these observations, the rollers were burned in the middle, making them thinner, and the edges remained unchanged. Today, this appliance is called a "skate". Further improvements resulted in two rollers remaining at the edges, and a thin axis between them. Later rollers began to do separately, and rigidly connect to the axle.