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1. (WO2010116710) PNEUMATIC TIRE

Pub. No.:    WO/2010/116710    International Application No.:    PCT/JP2010/002491
Publication Date: Fri Oct 15 01:59:59 CEST 2010 International Filing Date: Tue Apr 06 01:59:59 CEST 2010
IPC: B60C 11/11
B60C 5/00
B60C 11/03
Applicants: BRIDGESTONE CORPORATION
株式会社ブリヂストン
OCHI, Naoya
越智 直也
Inventors: OCHI, Naoya
越智 直也
Title: PNEUMATIC TIRE
Abstract:
Provided is a pneumatic tire having a tread pattern appropriately formed to dramatically improve on-ice performance and ensure performance balance with other performances. Specifically provided is a pneumatic tire, wherein two or more block groups (GB) each comprising a plurality of blocks (3) which are independent of each other and defined by grooves are provided in a tread section (1), when the reference pitch length of a block (4) present in the block group (GBn) is PL (mm), the width of the block group is W (mm), the number of blocks present in a reference zone of the block group is a (pieces), the reference zone being defined by the reference pitch length (P) and the width (W), and the negative ratio in the reference zone is N (%), the densities (D) (pieces/mm2) of the number of blocks in the respective block groups given under the condition of a/{PL×W×(1-N/100)} are two or more different densities of the number of blocks, and the density of the number of blocks in at least one block group falls within the range of 0.004-0.03.