| http://www.w3.org/ns/prov#value | - In particular, the BrIBIMS may be present from 10 to 50 phr in the tread composition, natural rubber may be present from 5 to 50 phr of the tread composition, and polybutadiene rubber may be present from 10 to 60 phr of the tread composition, while a filler such as carbon black or carbon black/silica blends, or silica may be present from 30 to 100 phr of the composition.
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