A pneumatic tire comprising a tread which contacts a road surface and comprises a rubber composition which contains a rubber component composed of 70% by weight or more of a copolymer of a conjugated diene and a vinyl aromatic hydrocarbon and a remaining amount of another synthetic rubber and/or natural...http://www.google.com.au/patents/US6095217?utm_source=gb-gplus-sharePatent US6095217 - Pneumatic tire including cap layer and base layer
