Patent ID: 8215350
Filing Date: 2012-07-10
Classification: B60C,Y10S,Y10T

Abstract:
1. A pneumatic radial ply truck tire having a tread with a tread depth D, at least two circumferential grooves dividing the tread into at least a first shoulder circumferential rib, an intermediary circumferential rib, and a second shoulder circumferential rib, the tire being characterized by: the tread having a first wear indicator disposed within at least one circumferential groove and a second wear indicator disposed within a rib for confirmation of tread wear; a plurality of elongate discrete notches formed to extend into the tread first shoulder rib, second shoulder rib, and intermediary rib in respective circumferential patterns; at least one notch in each circumferential pattern extends to a depth corresponding with the depth of the first wear indicator within the at least one circumferential groove; the tread having a base region disposed at depth D and a cap region over the base region, the base region and the cap region adjoining along a boundary, the cap region comprising a cap rubber composition having properties measured at 23° C. of: elongation of 400 to 500%, true tensile of 77 to 83 MPa, 300% modulus of 9 to 11 MPa, tensile strength of 14 to 15 MPa, shore A hardness of 63 to 68, rebound of 20 to 25%; and the base region comprising a base rubber composition having properties measured at 23° C. of: elongation of 470 to 520%, true tensile of 135 to 150 MPa, 300% modulus of 13 to 15.5 MPa, tensile strength of 22 to 25 MPa, shore A hardness of 63 to 67, rebound 50 to 55%.