How does the rolling resistance arise? What is that?

When a tire moves, the so-called rolling resistance. This has a significant influence on the efficiency of the tire and therefore on the fuel consumption. It needs energy for any form of movement. This applies to both the initiation of movement and the maintenance of the state of movement. At the same time there are different forces that make movement counteract. For example, when driving uphill by car Wind, gravity and the flooring cause a loss of energy in this movement. The forces that act on the tire are referred to as Rolling resistance.

the rolling resistance

The movement of a tire on the road ensures friction. Both the tire and the road surface bend slightly on contact. This friction creates heat, which consumes part of the energy used and thus the movement is withdrawn. How much energy is lost depends on the nature of the tire and the road surface. While you usually have no influence on the condition of the road surface, with tires the Tire construction, Air pressure, the rubber compound and the profile will reduce rolling resistance.

Eliminating rolling resistance entirely is neither possible nor would it be wise to do so. Finally, rolling resistance also guarantees the controllability of a vehicle and ensures that a car can brake and bounce. The rolling resistance also prevents aquaplaning and reduces the risk. This phenomenon is called grip and describes the "gearing“Of the tire with the road surface. While eliminating the rolling resistance factor is not the goal, tire manufacturers are primarily working on this optimization, e.g. in the form of Eco tires.

the rolling resistance increases with the contact surface

One way to reduce rolling resistance is to use the Increase air pressure and thus the tread of the tire on the road decrease. Here, however, the driving comfort and the Safety loweredbecause the lack of grip limits the steering properties and resistance to aquaplaning.

Influence of rolling resistance on fuel consumption and the environment

A higher rolling resistance has an increased at the same time Energy expenditure for movement and consequently increased fuel consumption. The rolling resistance is here for up to 70% of the energy loss responsible. A reduction in rolling resistance also has the effect of reducing the need for fuel or electrical energy.

The latest tires already achieve energy savings of about 7,5%Which definitely pays off with an average mileage of 20.000 kilometers per year and recently steep increases in fuel prices. The environment also benefits from lower rolling resistance. One obvious point is the reduction in fuel consumption and the associated lower CO2 emissions. At the same time, a reduced rolling resistance also leads to less abrasion on the tires and thus extends their service life.

Labeling of tires and smart purchase decisions!

Rolling resistance is an important one, but not the only criterion in the manufacture and use of tires. After all, a tire should, if possible, guarantee driving safety in all weather and ground conditions, run as quietly as possible and promote the driving comfort of the vehicle's occupants. The decisive value for the efficiency of a tire is the so-called Drag coefficient or Rolling resistance coefficient, which puts the rolling force in relation to the wheel load. So that the physics novice is spared the arithmetic when buying a tire, the EU has made it easier to identify a tire with low rolling resistance Fuel classesprinted on the tire. The rolling resistance efficiency classes are compared with the Letters A to G where A denotes the best and G the worst energy efficiency.

keep an eye on the fuel class

When buying new tires one should consider the fuel grade never neglect. It is true that buying a tire with poor energy efficiency usually saves money, but this saving is eliminated by the higher fuel consumption in the long term and a more expensive tire can ultimately be used the cheaper choice be. In addition, there are the mentioned environmental protection aspects, which may also play a role for one or the other buyer. In order to save money in the long term, it can be advisable not to lose sight of the quality of the tire.

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