Patent ID: 6170546
Filing Date: 2001-01-09
Classification: B60C,Y10S

Abstract:
A heavy duty pneumatic tire comprisinga tread portion, the tread portion provided with wide circumferential grooves having a width of 4.0 mm to 20.0 mm and narrow circumferential grooves having a width of not less than 2.0 mm but less than 4.0 mm,regions each defined between one of the wide circumferential grooves and the axially adjacent narrow circumferential groove,each said region provided with axial grooves extending from the wide circumferential groove to the narrow circumferential groove to circumferentially divide the region into blocks,the axial grooves in each said region including variable-width grooves of which groove width increases from the wide circumferential groove to the narrow circumferential groove continuously at a substantially constant rate, and constant-width axial grooves of which groove width is constant.