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Title:
TIRE FOR MOTORCYCLE FOR IRREGULAR GROUND RUNNING
Document Type and Number:
Japanese Patent JP2013147231
Kind Code:
A
Abstract:

To provide a tire for a motorcycle for irregular ground running which improves earth removing performance in the vicinity of a shoulder part, and gripping force and steering stability when turning.

In a tire for a motorcycle for irregular ground running, a plurality of blocks 9 are provided in a tread section 2, and a rotation direction R is specified. The block 9 includes a crown block 11, a shoulder block 12, and a middle block 13. A land-sea ratio L/S which is a ratio of a summation L of grounded areas of the blocks 9 to a summation S of areas of a groove bottom surfaces 10 is 15 to 25%. Groove bottom projections 14 are provided in a shoulder groove bottom region 15. A height h4 of the groove bottom projection 14 is 1 to 8 mm. A maximum size W4 of a cross section in a groove bottom surface 10 is 0.5 to 5 mm. A ratio Sp/Sb of a summation Sp of areas of the cross sections of the groove bottom projections 14 in the groove bottom surfaces 10, to a total area Sb of the shoulder groove bottom regions is 10 to 40%.


Inventors:
NAYA NOZOMI
Application Number:
JP2012000011316
Publication Date:
August 01, 2013
Filing Date:
January 23, 2012
Export Citation:
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Assignee:
SUMITOMO RUBBER IND
International Classes:
B60C11/04; B60C11/03; B60C11/11; B60C11/13
Domestic Patent References:
JPH05104911A1993-04-27
JPS63903U1988-01-06
JP2002036823A2002-02-06
Attorney, Agent or Firm:
住友 慎太郎



 
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