4.1.10. Measurement of height of the drawing of a protector

NOTE
It is necessary to make measurements for determination of height of the drawing of a protector in the main dredging of a protector.
Not to measure on TWI (Tread Wear Indikator means. indicator of wear of a protector).

It is necessary to measure height of the drawing of a protector in the main dredging of a protector in the most strongly worn-out places of the tire. Provisions of indicators of wear of a protector are visible on a protector shoulder.
Instead of "TWI" the D badge or "a company logo "of the producer can be specified.
Ledges of the indicator of wear of a protector have height of 1,6 mm. This size is the minimum depth of the drawing of a protector ordered in Germany legislatively.
Other norms can work in other countries.

Fig. 4.5. Indication of wear of the tire: A – tags of the indicator of wear of a protector in the main flutes of a protector; B – the main flutes of a protector with tags of the indicator of wear of a protector


Tags of indicators of wear of a protector cannot be taken into account at measurement. Size in the deepest place of a flute of a protector (fig. 4.5) is decisive.