Truck wire with cap/base construction tread

A pneumatic tire (1) comprising a tread with a tread cap (2) and a tread base (3) in a tread base to tread cap volume ratio ranging from 0.25 to 1; the tread cap (2) comprising, based on 100 parts by weight rubber (phr) 100 phr of cis 1,4 polyisoprene natural rubber; from 25 to 50 phr of carbon black; and from 8 to 35 phr of silica; the tread base comprising 100 phr of cis 1,4 polyisoprene natural rubber; from 25 to 50 phr of carbon black; and from 8 to 35 phr of silica; wherein the tread cap has a stiffness greater than that of the tread base.