The block row (10) includes a center block row (10A) composed of center blocks (11) arranged to straddle a tire equator (C).

In the intermediate shoulder block row are arranged long blocks having a circumferential length equivalent to the length of two blocks of the shoulder block row.

A block row having center blocks (6) is formed in the center portion (Ce).

In each course of each wall the imaginary square nets (8) of the blocks are wholly placed between the edges of the wall, and the hollows (6) of each block receive the lugs (7, 11) of similar blocks positioned longitudinally or transversely.

Blocks (20) interlock at cutouts (24) to form a row of blocks.

A center block row (30), and second block rows (32A), (32B), which are respectively adjacent to the outer sides of the center block row (30) in the width direction of the tire, are formed in a tread part (16).

The tread part (16) comprises a center block row (32) and 2ND block rows (34L) and (34R).

As a result, a center land section (6) has a block row (15) having a large number of divided substantial blocks (14).

One side block row is disposed on each of the two sides of the group of polygonal blocks in the width direction of the tire.

Each block (12) is placed end to end next to each other forming a first course of blocks (12).

The off-road pneumatic tire (1) has on a tread section (2) at least one block row (10) composed of blocks (9) arranged in the tire circumferential direction.

The straight-lined row of blocks that create a circumferential contact "band.

  Tread-in ends of the blocks in each row of blocks when the tire rolls under load are spaced apart from each other in the tread circumference direction.

Lay down your fire bricks inside of the first row of blocks.

The wall (10) continues upwardly as blocks (12) are positioned over the streams of mortar (24) placed on the sides of each course of blocks (12).