Judging by the reviews and our own experience, there are reasonable suspicions that either the quality of the studding of these tires "floats" from batch to batch and there is insufficient quality control in production, or the manufacturer consciously, in different years of production, changes the composition of the tire mixture, which, in turn, it affects the strength of the studs in one direction or another, and at the same time, some other characteristics of the tire change, which he sees as See full review