The little hairs on tires, commonly referred to as vent spews or tire whiskers, are small strands of rubber that form during the tire manufacturing process, particularly during vulcanization. They result from excess rubber escaping through tiny vent holes in the mold to prevent trapped air bubbles from compromising the tire's structural integrity[1][2][4]. While these hairs serve a purpose during manufacturing as indicators of proper venting, they do not affect the performance or safety of the tires once in use[3][5]. Their presence signifies that the tires are new, and they typically wear off after a few hundred miles, indicating that the tire is breaking in[3].
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