Patent ID: 6347653
Filing Date: 2002-02-19
Classification: B60C

Abstract:
In a heavy duty pneumatic tire comprising; a tread portion, a plurality of lug grooves formed in the tread portion and extending from each end of the tread portion toward an equator of the tire, and a central land portion continuously extending between two circumferential lines each formed by connecting terminal positions of these lug grooves substantially in a circumferential direction of the tire, wherein a tread rubber constituting the tread portion has a loss tangent at room temperature of 0.04-0.40, and a negative ratio at a region corresponding to at least 50% of a tread width around the equator is 10-30%, and a maximum value of a groove depth of the lug groove located at a zone corresponding to at least 80% of the tread width around the equator is not less than 60 mm, and a circumferential shallow groove extending along the circumferential direction of the tire is formed in the central land portion, wherein said circumferential groove is shallow relative to said lug grooves and the circumferential shallow groove has a groove width corresponding to 30-80% of a distance between the two circumferential lines.