| 摘要 |
PROBLEM TO BE SOLVED: To improve the steering stability and the rolling stability while improving the wandering performance. SOLUTION: When the direction of the inclination of a belt code of a first belt ply 11 is defined to be positive (+), the direction of the inclination of a second belt ply 12 is negative (-), and that of a third belt ply 13 is positive (+). The following inequalities are satisfied, whereα1C toα3C are the code angles on the tire equator of the first to third belt plies 11-13, andα1S toα3S are the code angles at an outer end of each ply.|α1C|<|α1S|,|α2C|<|α2S|,|α3C|<|α3S|, 30 deg.<=|α1C+α2C|<=50 deg., 0 deg.<=|α2C+α3C|<=5 deg., 30 deg.<=|α1S+α2S|<=54 deg. and 0 deg.<=|α2S+α3S|<=5 deg..
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