Pneumatic tire tread

A pneumatic tire having a tread that is formed from a rubber composition and that contacts the road surface when the tire rolls, comprising:

• a tread portion, in which is formed at least one primary groove of depth D and width W having a base surface and two opposing walls, and
• multiple flexible fences of thickness B, which extend inside the primary groove such that at least 70% of the cross-sectional area of the primary groove is blocked and which are disposed at intervals such that at least one of the multiple flexible fences is in the primary groove in the tread contact patch when the tire is rolling,
• wherein the multiple flexible fences are formed from at least a rubber composition for fences that is different from the rubber composition for the tread portion;
• the rubber composition of the flexible fences has an abrasion index that is greater than or equal to twice the abrasion index of the rubber composition of the tread portion;
• and the rubber composition for fences comprises a filler composition that is based on
• (a) a diene elastomer,
• (b) a reinforcing filler, which is selected from the group consisting of carbon black, inorganic fillers, organic fillers and mixtures of these fillers and is less than 50 phr;
• (c) a plasticizing system which is selected from the group consisting of liquid plasticizers, hydrocarbon-based resins, and mixtures thereof;
• and
• (d) a vulcanizing system.