Patent ID: 7799862

Claim:
A heavy-vehicle or construction vehicle tire, comprising a crown and a tread, the crown including a crown reinforcement comprising a cross-linkable or cross-linked rubber composition having a reduced hysteresis in the cross linked state, said composition comprising: an elastomeric matrix comprising natural rubber or a synthetic polyisoprene in a majority proportion of the matrix, and a reinforcing filler comprising a carbon black, wherein said carbon black satisfies the following conditions: (i) 50≦CTAB specific surface area in m 2 /g (in accordance with Standard ASTM D3765-80)≦55, (ii) 45≦BET specific surface area in m 2 /g (in accordance with Standard D4820-93)≦70, (iii) 45≦iodine adsorption index IA in mg/g (in accordance with Standard ASTM D1510-81)≦70, (iv) ratio (BET surface area / index IA)≦1.05, (v) 115≦DBP structure value in ml/100 g (in accordance with Standard ASTM D2414-93)≦170, (vi) 85≦Stokes diameter dst in nm≦145, wherein dst is the diameter of aggregates corresponding to the maximum frequency of the Stokes diameters in a distribution of aggregates, and (vii) D50/dst≧0.0090·CTAB+0.19, wherein D50 is the difference, in the distribution of aggregates, between the Stokes diameters of two aggregates corresponding to one and the same frequency equal to 50% of the maximum frequency of the Stokes diameters, dst and D 50 being measured by centrifugal photosedimentometry.