Heavy duty pneumatic tire including variable width grooves and constant width grooves

摘要

A heavy duty pneumatic tire comprises a tread portion which is provide with wide circumferential grooves having a width Wm1 of 4.0 mm to 20.0 mm and narrow circumferential grooves having a width Wm2 of not less than 2.0 mm but less than 4.0 mm, and each region which is defined between one of the wide circumferential grooves and the axially adjacent narrow circumferential groove is provided with axial grooves extending from the wide circumferential groove to the narrow circumferential groove to circumferentially divide the region into blocks, wherein the axial grooves include variable-width grooves of which groove width increases from the wide circumferential groove to the narrow circumferential groove.