Heavy duty pneumatic tire

1. A heavy duty pneumatic tire, comprising a tread portion,

the tread portion comprising a rubber composition containing:

an isoprene rubber;

a butadiene rubber;

a styrene-butadiene rubber; and

a carbon black having at least one of

an average particle size of 20 nm or less or

a cetyltrimethylammonium bromide adsorption specific surface area of 130 m 2 /g or more,

entire tread portion having a land ratio of 81% or higher;

wherein the rubber composition has abrasion resistance index of 140 or higher.

2. The heavy duty pneumatic tire according to claim 1 , wherein the rubber composition further contains a carbon black having at least one of an average particle size of more than 20 nm but not more than 25 nm or a cetyltrimethylammonium bromide adsorption specific surface area of at least 100 m 2 /g but less than 130 m 2 /g.

3. The heavy duty pneumatic tire according to claim 1 , wherein the rubber composition has a total styrene content of 2.0 to 11.0% by mass based on 100% by mass of a rubber component in the rubber composition.

4. The heavy duty pneumatic tire according to claim 1 ,

wherein the amount of the isoprene rubber based on 100% by mass of the rubber component in the rubber composition being 40% by mass or less.

5. The heavy duty pneumatic tire according to claim 1 ,

wherein the rubber composition further contains a second carbon black having at least one of

an average particle size of more than 20 nm but not more than 25 nm or

a cetyltrimethylammonium bromide adsorption specific surface area of at least 100 m 2 /g but less than 130 m 2 /g.