How is rolling resistance measured?
The rolling resistance measurement test meets very specific standards, respected by all manufacturers.
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The measuring device
Rolling resistance is measured in the laboratory (at a controlled temperature of 25°C). A 2 m diameter drum is used to which is applied the tyre to be tested with a given load and pressure. To rotate the drum empty, a certain torque needs to be applied. When the tyre is in contact with the drum, the torque required to rotate the drum increases. By measuring the difference between these two torques, a residual torque, known as "resistance to advance" is obtained. Converted into a force, it can be expressed in kilograms per tonne (kg/t).
An internationally standardized test
Encouraged by carmakers, tyre manufacturers conducted crossover tests on batches of tyres, which enabled the agreement on different types of measurements. Today, these measurements can be reproduced for any tyre. "The test is now standardized on the same reference tyre", indicates Vincent Marquis, head of car tyre section and public relations at Continental France. The test now complies with the ISO 28580 standard and is conducted on a 235/60 R 16 tyre.
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