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ISO 9112

2nd Edition, February 15, 2008

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Truck and bus tyres — Methods of measuring tyre rolling circumference — Loaded new tyres



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Description / Abstract:

This International Standard specifies two methods for measuring the rolling circumference and the number of revolutions per unit distance (kilometre) of new commercial vehicle tyres, under loaded conditions, for use on trucks and buses.

The first method is a drum method consisting of loading a test tyre mounted on a free axle against a driven road wheel (or drum) of specified diameter. The second method involves a vehicle whose drive axle is equipped with the test tyres driven on a straight, paved road. The values thus obtained are not intended for use as levels of performance or quality.

This International Standard applies to all truck and bus tyres.

NOTE This International Standard applies not only to large truck and bus tyres, but also to small truck and bus tyres, which are called "light truck tyres" in some countries.

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