19.2. Indicators of wear of tires
Fig. 13-1. A marking arrangement on a tire sidewall (for example, the letters TWI or the pictogram in the form of a triangle)
In flutes of the drawing of a protector of tires there are indicators of wear of tires 1,6 mm high located at right angle to the direction of progress of the tire. Indicators (from six to eight depending on firm manufacturer) are placed through equal distances on a tire circle. Marking on a tire sidewall (for example, the letters TWI or the pictogram in the form of a triangle) show location of indicators of wear of tires (fig. 13-1).
Intensive wear of tires is promoted by a sports manner of driving, sharp dispersals and braking.
Tires it is possible to operate 1,6 mm before achievement of height of a protector, that is depth of flutes of a protector on all surface of the tire has to be not less than 1,6 mm. However for safety it is recommended to change tires with a depth of protector of 2 mm.
Tires of "M+S" on snow have sufficient coupling with the road with a height of protector not less than 4 mm.
It is necessary to examine the tire. If deep cuts reach a cord, the steel cord will korrodirovat from the getting moisture.
Worn-out tires do not provide, necessary coupling with a paving, especially at the movement with a high speed on the wet road. Besides, at worn-out tires there comes the hydroplaning (loss of coupling with a wet paving) much quicker.