Rolling resistance is one of the important properties of a tire, which affects the kinetic energy consumption of the vehicle and the life of the tire itself. Reducing the rolling resistance can improve the sporting performance of the vehicle, and at the same time, it can extend the running life of the tire due to the reduction of deformation energy and heat generation. The rolling resistance can be identified by the rolling resistance coefficient or by the work required to overcome the rolling resistance for each revolution of the wheel. Rolling resistance is consumed by tire deformation, road surface deformation, and tire-to-road attachment. Therefore, the rolling resistance depends on the type of road, the condition, and the structure and performance of the tire.
Rolling resistance is the energy lost when the tire rolls. The main cause of energy loss is the constant deformation of the tire.
Of course, every bicycle tire should roll as easily as possible. Compared to cars, cyclists have only (very limited) physical strength and he wants to apply them as efficiently as possible.
In addition to rolling resistance, other resistances must be overcome when riding a bicycle:
As the speed increases, the air resistance rises in a square ratio. Air resistance has become a major resistance at an approximate speed of 20 km/h on the ground.
Acceleration energy is also consumed. For example, when the mass has to be rotated, the weight of the wheel is very important.
The main resistance to overcome when going uphill is the gradient resistance (slope resistance).
In addition to this, the chain and other rotating parts have other frictional resistance. However, in a well-served bicycle, these represent a small fraction of the total resistance.