Abstract: In accordance with the invention, a ply coat rubber composition for a tire ply comprises from 60 phr to 90 phr of natural rubber, from 10 phr to 40 phr of synthetic polyisoprene, from 30 phr to 80 phr of pre-silanized and precipitated silica, from 0.1 phr to 5 phr of a cobalt salt, up to 15 phr of carbon black, up to 5 phr of resin, and up to 8 phr of oil. Moreover, the invention is directed to a tire comprising such a rubber composition.

Abstract: The invention relates to a wire coat rubber composition for coating metal wires in a tire, the rubber composition comprising from 60 to 100 phr of natural rubber, from 0 to 40 phr of synthetic polyisoprene, from 40 to 70 phr of oxidized carbon black, up to 5 phr of a resin and up to 8 phr of oil. The present invention also relates to a tire comprising such a wire coat composition.

Abstract: In accordance with the invention, a ply coat rubber composition for a tire ply comprises from 60 phr to 90 phr of natural rubber, from 10 phr to 40 phr of synthetic polyisoprene, from 30 phr to 80 phr of pre-silanized and precipitated silica, from 0.1 phr to 5 phr of a cobalt salt, up to 15 phr of carbon black, up to 5 phr of resin, and up to 8 phr of oil. Moreover, the invention is directed to a tire comprising such a rubber composition.

Abstract: A self-inflating tire assembly includes an air tube mounted within a tire sidewall groove. The air tube is in contacting engagement with opposite angled groove surfaces surrounding the air tube. A segment of the air tube is flattened from an expanded diameter to a flat diameter by bending and compression of the groove in a rolling tire footprint to force air evacuated from the flattened segment along a tube air passageway. The sidewall groove extends into an annular, axially extending, sidewall surface such as an axially oriented surface of a tire chafer protrusion located in non-contacting relationship with the rim. The air tube is extruded from a rubber composition, the rubber composition comprising: a diene based rubber; from 0.

Abstract: A self-inflating tire assembly includes an air tube mounted within a tire sidewall or chafer groove. The air tube is in contacting engagement with opposite angled groove surfaces surrounding the air tube. A segment of the air tube is flattened from an expanded diameter to a flat diameter by bending and compression of the groove in a rolling tire footprint to force air evacuated from the flattened segment along a tube air passageway. A coverstrip overlays and seals the groove and provides an abrasion resistant surface on the exterior of the tire. The coverstrip is made from a vulcanizable rubber composition comprising from 50 to 80 phr of a polybutadiene, from 50 to 20 phr of natural rubber, and from 0.1 to 5 phr of a vulcanization modifier.

Abstract: A self-inflating tire assembly includes an air tube mounted within a tire sidewall or chafer groove. The air tube is in contacting engagement with opposite angled groove surfaces surrounding the air tube. A segment of the air tube is flattened from an expanded diameter to a flat diameter by bending and compression of the groove in a rolling tire footprint to force air evacuated from the flattened segment along a tube air passageway. A coverstrip overlays and seals the groove and provides an abrasion resistant surface on the exterior of the tire. The coverstrip is made from a vulcanizable rubber composition comprising from 50 to 80 phr of a polybutadiene, from 50 to 20 phr of natural rubber, and from 0.1 to 5 phr of a vulcanization modifier.

Abstract: A self-inflating tire assembly includes an air tube mounted within a tire sidewall groove. The air tube is in contacting engagement with opposite angled groove surfaces surrounding the air tube. A segment of the air tube is flattened from an expanded diameter to a flat diameter by bending and compression of the groove in a rolling tire footprint to force air evacuated from the flattened segment along a tube air passageway. The sidewall groove extends into an annular, axially extending, sidewall surface such as an axially oriented surface of a tire chafer protrusion located in non-contacting relationship with the rim. The air tube is extruded from a rubber composition, the rubber composition comprising: a diene based rubber; from 0.