BIAS-CONSTRUCTION PNEUMATIC TIRE PRODUCED BY HIGH MOLDING METHOD

摘要

PURPOSE:To enhance abrasion reistance and cutting resistance, by specifying a high molding degree and the radius of curvature of a composite crown of a tread, in a large-type tire comprising a bias carcass as a main reinforcement and produced by the high molding method. CONSTITUTION:In the high molding method, a tire molded and vulcanized in a mold is inflated to cause a reduction in outside diameter concurrently with an increase in width, thereby obtaining a natural shape. When producing a pneumatic tire comprising a bias carcass as a main reinforcement by the high molding method, the high molding degree alpha represented by the coefficient of reduction of the ratio of the carcass height to the carcass half-width based on the inflation is set in the range of 12-22%. In addition, the ratio of the product of the radius of curvature R2 of the crown in a residual tread region and the high molding degree alpha to the radius of curvature R1 of the crown in a central tread region extending over 30-60% of the tread half-width of the tire, is set in the range of 4.5-7.5. Accordingly, abrasion resistance and cutting resistance can be enhanced.