Heavy duty pneumatic tire

A heavy duty pneumatic tire comprising

• a tread portion having a tread width and provided with circumferentially continuously extending main grooves and lateral grooves so as to form blocks in a plurality of circumferential rows,
• the main grooves include a pair of shoulder main grooves disposed one on each side of the tire equator so that the center line of the groove is at a distance of 0.30 to 0.65 times one half of tread width from the tire equator,
• the blocks include
• crown blocks disposed in a tread crown region between the shoulder main grooves, and shoulder blocks disposed in shoulder regions axially outside the shoulder main grooves,
• each of the crown blocks and shoulder blocks is provided with at least one sipe extending in a tire axial direction,
• wherein
• the following equation (1) is satisfied,
• (SScr+SBcr)/(SSsh+SBsh)≧1.05 (1)
• wherein
• SScr:
• a total sum of axial lengths of the sipes of all of the crown blocks,
• SBcr:
• a total sum of axial lengths of lateral edges of the ground contacting faces of all of the crown blocks, wherein each of the lateral edges is one of two circumferentially-opposite lateral edges of the ground contacting face of one of the crown blocks,
• SSsh:
• a total sum of axial lengths of the sipes of all of the shoulder blocks, and
• SBsh:
• a total sum of axial lengths of lateral edges of the ground contacting faces of all of the shoulder blocks, wherein each of the lateral edges is one of two circumferentially-opposite lateral edges of the ground contacting face of one of the shoulder blocks.