The less height of the drawing of a protector, the is more risk of sliding of the tire. Efficiency of tires for the movement on snow is significantly lost if the protector wears out up to the height, smaller, than 4 mm.

Fig. 4.1. Check of height of the drawing in protectors at the stand

Check height of the drawing of a protector (fig. 4.1).

The minimum height of the drawing of a protector for summer tires: 1 mm.