Pneumatic tire

1. A pneumatic tire with mediate land portions formed adjacently to shoulder land portions disposed on both sides of the tire in a tire width direction respectively, wherein

sipes are formed in the mediate land portions respectively, the mediate land portion disposed inside in a vehicle width direction in a state where the pneumatic tire is mounted on the vehicle has larger sipe density and projects more outwardly in a tire radial direction than the mediate land portion disposed outside in the vehicle width direction,

wherein a ratio of the sipe density of the mediate land portion disposed inside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle to the sipe density of the mediate land portion disposed outside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle falls within a range of 1.2 to 3.5 inclusive,

an apex of the mediate land portion disposed inside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle projects higher than an apex of the mediate land portion disposed outside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle by an amount which falls within a range of 0.2 mm to 1.5 mm inclusive,

wherein the pneumatic tire includes a center land portion at the center thereof in the tire width direction, the center land portion projects outwardly in the tire radial direction from a tire reference profile line, and a projecting amount of the center land portion is smaller than a projecting amount of the mediate land portion disposed inside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle, and

wherein sipes are formed in the center land portion, a portion of the center land portion disposed inside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle has larger sipe density than a portion of the center land portion disposed outside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle, and an apex of a projecting portion toward the outside in the tire radial direction is formed on a portion of the center land portion disposed inside in the vehicle width direction from the center of the center land portion in the width direction in a state where the pneumatic tire is mounted on the vehicle.

2. The pneumatic tire according to claim 1 , wherein

an apex of the mediate land portion disposed inside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle projects higher than an apex of the center land portion by an amount which falls within a range of 0.2 mm to 1.0 mm inclusive.

3. The pneumatic tire according to claim 1 , wherein an apex of a projecting portion of the center land portion is disposed at a position displaced inwardly in the vehicle width direction from the center of the center land portion in the width direction in a state where the pneumatic tire is mounted on the vehicle by a length which falls within a range of 25% to 50% inclusive of a half width of the center land portion.

4. The pneumatic tire according to claim 1 , further including

at least three or more main grooves extend around a circumference of a tread of the tire, including main grooves separating said mediate and shoulder land portions.

5. The pneumatic tire according to claim 4 , wherein a projecting amount of the mediate land portion disposed inside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle is larger than a projecting amount of all other land portions of the tire.

6. The pneumatic tire according to claim 4 , wherein

wherein a projecting amount of another land portion in between said mediate land portions is smaller than a projecting amount of the mediate land portion disposed inside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle and is larger than a projecting amount of the mediate land portion disposed outside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle.

7. The pneumatic tire according to claim 4 , wherein

sipes are formed in another land portion in between said mediate land portions,

a portion of said another land portion disposed inside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle has larger sipe density than a portion of said another land portion disposed outside in the vehicle width direction in a state where the pneumatic tire is mounted on the vehicle.