| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a pneumatic tire excellent in hydroplaning-proof properties and slush snow performance in addition to performance on snow and on ice. <P>SOLUTION: In the pneumatic tire, a tread step surface of the tire is divided to a plurality of land parts by a plurality of circumferential grooves extending along a circumferential line of the tread and a plurality of grooves in a width direction extending in a width direction of the tread. At least one of the circumferential grooves is made to a circumferential main groove having opening width of 5% or more of a tread step surface width, and a second groove is formed on a bottom part of the circumferential main groove. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
