Patent ID: 7950431

Claim:
A pneumatic bias tire comprising plural pairs of bead cores and plural carcass ply groups corresponding to the number of bead core pairs, carcass plies of ply cords coated with a coating rubber constituting each group being wound around each corresponding bead core pair, and having a ply rating of not less than 58 and an aspect ratio of not more than 80%, in which a rubber volume as the product of the sum of each distance between ply cords in an inner mutually adjoining carcass ply per 50 mm, the sum of each distance between ply cords in an outer mutually adjoining carcass ply per 50 mm, and a distance between ply cords of mutually adjoining inner and outer carcass plies with respect to three or more inside carcass plies of an innermost carcass ply group in at least a portion corresponding to a position of a maximum tire width is 500-1350 mm 3 .