{HEAD ~ A rubber composition} for {TAIL ~ tire treads} having improved rolling resistance and wet road braking performance, comprising a chlorinated butyl rubber and a brominated butyl rubber, natural rubber and a polyisoprene rubber and, if desired, a polybutadiene rubber in specific blending ratios 
for
{ HEAD ~ A rubber composition } for { TAIL ~ tire treads } having improved rolling resistance and wet road braking performance , comprising a chlorinated butyl rubber and a brominated butyl rubber , natural rubber and a polyisoprene rubber and , if desired , a polybutadiene rubber in specific blending ratios
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