Patent ID: 8479792
Filing Date: 2013-07-09
Classification: B60C,D07B

Abstract:
1. A motorcycle tire comprising a tread portion, a pair of sidewall portions, a pair of bead portions, a toroidal carcass extending between the bead portions through the tread portion and sidewall portions, and a band disposed radially outside the carcass in the tread portion, wherein said tread portion has a tread face which is convexly curved while extending from one of tread edges to the other so that the maximum section width of the tire lies between the tread edges, said carcass comprises at least two cross plies of carcass cords arranged at an angle of from 20 to 80 degrees with respect to the tire circumferential direction, said band comprises at least one band ply of at least one helically wound band cord, and said band cord is a steel cord made up of a plural number N of second strands which are final twisted together, each of the second strands is made up of a plural number M of primary strands which are second twisted together, each of the primary strands is made up of a plural number L of steel filaments which are first twisted together, and each of the steel filaments has a filament diameter (d) of from 0.08 to 0.20 mm, wherein the steel cord has a low tensile elastic modulus range and a high tensile elastic modulus range, wherein the tensile elastic modulus of the steel cord in the low tensile elastic modulus range is lower than the tensile elastic modulus of the steel cord in the high tensile elastic modulus range, an inflection point between the low tensile elastic modulus range and the high tensile elastic modulus range lies between 2% elongation and 7% elongation of the steel cord, said inflection point is the intersecting point between the load-elongation curve and a straight line drawn parallel to the axis of cord load from an intersecting point Pp between an extended line of the first linear part Y wherein the steel cord has an elongation characteristic which shows two definite linear parts in a load-elongation curve of the steel cord obtained by plotting values of both of the load and elongation in linear scales, the two linear parts are a first linear part Y