Tire with rubber tread of cap/base construction wherein the tread base rubber composition contains combination of anti-reversion agents

A tire having a rubber tread of a co-extruded cap/base construction wherein said tread base underlies said tread cap, wherein said tread cap is of a lug and groove configuration, and wherein said tread base is of a thickness of at least 50 percent of the thickness of said tread cap and said tread base is of a tread base rubber composition which is comprised of, based upon parts by weight per 100 parts by weight rubber (pbr)

• (A) 100 phr by weight of at least one diene-based elastomer of which at least 55 weight percent of the elastomer(s) is cis 1,4-polyisoprene natural rubber,
• (B) about 2.5 to about 5 phr of sulfur,
• (C) about 0.5 to about 10 phr of 1,3-bis-(citraconimidomethyl)benzene and hexamethylene 1,6-bis(thiosulfate), disodium salt, dihydrate wherein a weight ratio of said 1,3-bis-(citraconimidomethyl)benzene to said hexamethylene 1,6-bis(thiosulfate), disodium salt, dihydrate is in a range of from about 0.2/1 to about 0.5/1, and
• (D) about 25 to about 60 phr of reinforcing filler as
• (1) about 5 to about 50 phr of rubber reinforcing carbon black characterized by having an Iodine value in a range of about 38 to about 48 g/kg (ASTM D1510) and dibutyl phthalate (DBP) value in a range of about 110 to about 130 cm3/100 g (ASTM D2414), and
• (2) about 10 to about 20 phr of aggregates of precipitated silica, wherein
• said precipitated silica contains hydroxyl groups in its surface;
• and
• wherein said tread cap is of rubber composition which is exclusive of said 1,3-bis-(citraconimidomethyl)benzene and hexamethylene 1,6-bis(thiosulfate), disodium salt, dihydrate.