B - Operations – Transporting – 60 – C
Patent
B - Operations, Transporting
60
C
152/126
B60C 11/03 (2006.01)
Patent
CA 1296982
ABSTRACT A pneumatic tire characterized in that: a tread is divided into a crown portion having a width corresponding to about 30% to 65% of the tread width and two shoulder portions by at least two longitudinal grooves extending in substantially zigzag or wavy line; the crown portion is provided with one or more central ribs or central block rows; each shoulder portion is provided with one or more outer ribs or outer blocks; and the rib or blocks on shoulder portions are provided with a plurality of narrow cut grooves so that the circumferential stiffness index of the pattern and a volume index of the narrow cut grooves my be set at 30 to 70 and 2.5 to 15, respectively.
528590
Marks & Clerk
Sumitomo Rubber Industries Limited
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