HEAVY DUTY TIRE

A heavy duty tire 2 includes a tread 4 having a plurality of circumferential grooves 24. The plurality of circumferential grooves 24 divide the tread 4 into a plurality of land portions 26. The plurality of land portions 26 include a plurality of main land portions 32. Each main land portion 32 has a plurality of main lateral grooves 38. The plurality of main lateral grooves 38 divide the main land portion 32 into a plurality of main blocks 40. Each main lateral groove 38 includes a lateral groove body 54 and a bottom sipe portion 56. Each main block 40 has a transverse sipe 70. The transverse sipe 70 includes a sipe body 72 and a tubular portion 74. A circumferential groove 24 located between the adjacent main land portions 38 is a circumferential narrow groove 28 including a body portion 78 and an enlarged width portion 80.