Patent ID: 8403014

Claim:
A motorcycle tire for uneven terrain travel having a carcass extending from a tread portion to bead cores in bead portions through sidewall portions, said carcass comprising two carcass plies superposed in a radial direction of the tire as inner and outer carcass plies, in which carcass cords are arranged at an angle of 20 to 40° with respect to a circumferential direction of the tire and are covered with a topping rubber, each of said inner and outer carcass plies being an aramid ply using, as a carcass cord, an aramid fiber cord in which N (2 to 4) bundles of first-twisted aramid filaments are subjected to final twist, said aramid fiber cord having a total fineness D of 2,200 to 5,010 dtex and a twist factor T which is represented by the equation (1): T=n ×( √{square root over (D)} )×10 −3 (1) in which n is the number of final twists per 10 cm of the cord, and D is a total fineness of the cord (unit: dtex), and which falls within the following range: (a) a twist factor T within the range of 2.8 to 3.2 when said aramid ply is the inner carcass ply and the number N of filament bundles is 2, (b) a twist factor T within the range of 2.4 to 3.2 when said aramid ply is the inner carcass ply and the number N of filament bundles is 3 or 4, (c) a twist factor T within the range of 2.4 to 3.2 when said aramid ply is the outer carcass ply and the number N of filament bundles is 2, (d) a twist factor T within the range of 2.2 to 3.2 when said aramid ply is the outer carcass ply and the number N of filament bundles is 3 or 4, and the twist factor T of the aramid fiber cord used in the outer carcass ply is smaller than the twist factor T of the aramid fiber cord used in the inner carcass ply.