Wheels are inherently a bunch of pivoting around a fulcrum

Wheels are inherently a bunch of levers pivoting around a fulcrum.

A lever is a bar with balance point called the fulcrum. In a wheel, the fulcrum is in the centre. The fulcrum is the point against which a lever is placed. The outside rim of the wheel is like a handle of a lever.

Wheels reduce frictions, they dig into the ground and rotate ( pivot ), turning around sturdy rods called axles. They provide leverage, a cart with bigger wheels is easier to push because bigger wheels work like bigger levers, multiplying the pulling or the pushing force.