Tire with composite of chafer and outer sidewall rubber layer components

A pneumatic tire having a composite consisting of a combination of outer rubber sidewall layer and chafer component, where said rubber sidewall layer is integral with and extends radially outward from said chafer component, wherein each of said sidewall layer and chafer component are rubber compositions containing specialized cis 1,4-polybutadiene elastomer(s) comprised of, based on parts by weight per 100 parts by weight of rubber (phr):

• (A) 100 phr of conjugated diene-based elastomers comprised of:
• (1) cis 1,4-polybutadiene rubber consisting of specialized cis 1,4-polybutadiene elastomer, and
• (2) additional conjugated diene based elastomer comprised of at least one of cis 1,4-polyisoprene rubber and styrene/butadiene rubber, and
• (B) rubber reinforcing filler comprised of
• (1) rubber reinforcing carbon black, or
• (2) combination of rubber reinforcing carbon black and precipitated silica, and:
• (C) coupling agent for said precipitated silica, when said precipitated silica is used, having a moiety reactive with hydroxyl groups on said precipitated silica and another different moiety interactive with said elastomer(s);
• wherein said specialized cis 1,4-polybutadiene elastomers consist of:
• (1) a first specialized cis 1,4-polybutadiene elastomer having a microstructure comprised of about 94 to about 99 percent cis 1,4-isomeric units and a vinyl 1,2-content of less than one percent, a number average molecular weight (Mn) in a range of from about 180,000 to about 350,000 with less than 5 percent, of the rubber having a weight average molecular weight (Mw) of less than 100,000;
• and a heterogeneity index (Mw/Mn) in a range of from about 1.4/1 to about 2/1, and
• (2) a second specialized cis 1,4-polybutadiene having a microstructure comprised of about 94 to about 99 percent cis 1,4-isomeric units and a vinyl 1,2-content of less than one percent a number average molecular weight (Mn) in a range of from about 150,000 to about 300,000 with less than 10 percent, of the rubber having a weight average molecular weight (Mw) of less than 100,000;
• and a heterogeneity index (Mw/Mn) in a range of from about 1.4/1 to about 2/1;
• wherein the specialized cis 1,4-polybutadiene rubber for said sidewall component [and said chafer component] of said composite is:
• (3) said first specialized cis 1,4-polybutadiene rubber, or
• (4) said second specialized cis 1,4-polybutadiene rubber, and
• wherein the specialized cis 1,4-polybutadiene rubber for said chafer component of said composite is:
• (5) said second specialized cis 1,4-polybutadiene rubber.