In the invention a wearing layer (12) of a car tire is the projected parts, separated by the transversal grooves and/or the circular grooves, at least in some of which the first small slots (1) are made, which have a first depth (H1), a first length (L1) and a common first width (S1) and which pass into the wearing layer between two first walls (5a, 5b). A folded-wavy contour (13) of a section in the direction of the depth of the first small slots has an equal form throughout the first length (L1) and a first amplitude (A1). In addition, the sections in the direction of the length of the first small slots have the folded-wavy contour (14) throughout the first depth (H1), having a second amplitude (A2). The combination of the folded-wavy contour (13) of the section in the direction of the depth and the folded-wavy contour (14) of the section in the direction of the length of the first small slots has a total amplitude (A1+A2). The folded-wavy contour (13) has no more than two first peaks (6a) and no more than two second peaks (6b) oriented in the opposite direction. All peaks (6a, 6b, 7a, 7b) have a radius of curvature (R), and in the intersected sides of the peaks (9) the flat parts (B) are provided.
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