A tire comprising: a tread portion provided with blocks so that the tread portion has a land ratio (Lb/L) of from 18% to 35%, wherein the blocks include a grooved block provided with a zoning groove which defines a tall section of the grooved block having a ground contacting higher top surface, and a short section of the grooved block having a ground contacting lower top surface positioned radially inside the higher top surface, characterized in that the depth (da) of the zoning groove measured from the lower top surface is less than 20% of the maximum radial height of the grooved block, wherein said tall section is provided with a second groove whose depth (db) is less than 20% of said maximum radial height of the grooved block, wherein an intended rotation direction of the tire is specified, said short section comprises an axially inner part located on the axially inside of the tall section, and a heel-side part located on a heel-side of the tall section excluding the axially inner part, said grooved block satisfies the following condition E × ML / S > 2.0 wherein S is the total (sq.mm) of the area of the higher top surface and the area of the lower top surface, ML is the maximum length (mm) in the tire circumferential direction of the grooved block, and E is the total length (mm) of the axial components of effective heel-side edges of the grooved block, which is the sum of the following lengths E1 to E6: the length E1 of the axial component of a heel-side block edge of the axially inner part; the length E2 of the axial component of a heel-side block edge of the heel-side part; the length E3 of the axial component of a heel-side block edge of the tall section; the length E4 of the axial component of a heel-side block edge formed by the second groove; the length E5 of the axial component of a heel-side block edge formed by the zoning groove and positioned axially inside the tall section; and the length E6 of the axial component of a heel-side block edge formed by the zoning groove and positioned axially outside the tall section. a tread portion provided with blocks so that the tread portion has a land ratio (Lb/L) of from 18% to 35%, wherein the blocks include a grooved block provided with a zoning groove which defines a tall section of the grooved block having a ground contacting higher top surface, and a short section of the grooved block having a ground contacting lower top surface positioned radially inside the higher top surface, characterized in that the depth (da) of the zoning groove measured from the lower top surface is less than 20% of the maximum radial height of the grooved block, wherein said tall section is provided with a second groove whose depth (db) is less than 20% of said maximum radial height of the grooved block, wherein an intended rotation direction of the tire is specified, said short section comprises an axially inner part located on the axially inside of the tall section, and a heel-side part located on a heel-side of the tall section excluding the axially inner part, said grooved block satisfies the following condition E × ML / S > 2.0 wherein S is the total (sq.mm) of the area of the higher top surface and the area of the lower top surface, ML is the maximum length (mm) in the tire circumferential direction of the grooved block, and E is the total length (mm) of the axial components of effective heel-side edges of the grooved block, which is the sum of the following lengths E1 to E6: S is the total (sq.mm) of the area of the higher top surface and the area of the lower top surface, ML is the maximum length (mm) in the tire circumferential direction of the grooved block, and E is the total length (mm) of the axial components of effective heel-side edges of the grooved block, which is the sum of the following lengths E1 to E6: the length E1 of the axial component of a heel-side block edge of the axially inner part; the length E2 of the axial component of a heel-side block edge of the heel-side part; the length E3 of the axial component of a heel-side block edge of the tall section; the length E4 of the axial component of a heel-side block edge formed by the second groove; the length E5 of the axial component of a heel-side block edge formed by the zoning groove and positioned axially inside the tall section; and the length E6 of the axial component of a heel-side block edge formed by the zoning groove and positioned axially outside the tall section.