The invention relates to a tire having a rubber tread comprised of cap/base construction
where the tread cap layer is the running surface of the tread having a lug and
groove configuration and the tread base layer underlies the tread cap layer wherein
the base layer provides a transition zone between the tread cap layer and the remainder
of the tire carcass and is not intended to be ground-contacting. For this invention,
the tread cap layer is comprised of three distinct load-bearing zones which contain
reinforcing fillers selected from precipitated silica and carbon black, namely
a circumferential annular central zone of a rubber composition to promote traction
for the running surface of the tread, wherein the central zone is positioned between
two lateral and peripheral circumferential annular zones of a rubber composition
to promote resistance to tread wear for the running surface of the tread. In one
aspect, the zoned rubber tread cap layer and rubber tread base layer are co-extruded
together to form an integral tread rubber composite.