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

To measure height of drawing of a protector follows in the main dredging of a protector in the most strongly worn-out places of the tire. Positions of indicators of wear of a protector are visible on a protector shoulder.

Instead of «TWI» the badge can be specified «?» or «a firm logo» producer.

Ledges of the indicator of wear of a protector have height of 1,6 mm. This size is the minimum depth of drawing of the protector, ordered in Germany legislatively.

In other countries other norms can operate.

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

Labels of indicators of wear of a protector cannot be taken into consideration at measurement. The size in the deepest place of a flute of a protector (fig. 4.5) is solving .