Patent ID: 7493748

Claim:
A pneumatic tire comprising: a rubber component reinforced with metal cords each made of metal filaments twisted together, all said metal cords having the same initial elongation in a range of from 0.05 to 0.20%, wherein the initial elongation of each cord is the difference of an elongation in % of the cord at a load of 49N from an elongation in % of the cord at a load of 2.5N, all the metal filaments have the same diameter (d) in a range of 0.15 to 0.30 mm, all the metal filaments are shaped in the same two-dimensional zigzag waveform, the zigzag waveform has constant wave lengths (P) and constant wave heights (h), wherein the ratio (P/d) is in the range of 100/3 to 700/3, and the ratio (h/d) is in the range of 5/3 to 80/3, and in each metal cord all the metal filaments are shifted in the longitudinal direction of the cord so that the phases of the zigzag wave forms are evenly shifted, and so that the standard deviation of the initial elongation is in the range of not more than 0.02.